Added deprecation Division by zero when using power with zero as base and negative exponent

RFC: https://wiki.php.net/rfc/raising_zero_to_power_of_negative_number

Closes GH-13128

UPGRADING

@@ -352,6 +352,7 @@ PHP 8.4 UPGRADE NOTES
 - Standard:
   . Calling stream_context_set_option() with 2 arguments is deprecated.
     Use stream_context_set_options() instead.
+  . Raising zero to the power of negative number is deprecated.
 
 ========================================
 5. Changed Functions
@@ -545,6 +546,7 @@ PHP 8.4 UPGRADE NOTES
   . Added the http_get_last_response_headers() and
     http_clear_last_response_headers() that allows retrieving the same content
     as the magic $http_response_header variable.
+  . Added function fpow() following rules of IEEE 754.
 
 - XSL:
   . Added XSLTProcessor::registerPhpFunctionNS().

Zend/tests/runtime_compile_time_binary_operands.phpt

@@ -8,6 +8,7 @@ if (getenv("SKIP_SLOW_TESTS")) die('skip slow test');
 ?>
 --FILE--
 <?php
+error_reporting(E_ALL ^ E_DEPRECATED);
 
 $binaryOperators = [
     "==",
@@ -122,7 +123,7 @@ function prepareBinaryLine($op1, $op2, $cmp, $operator) {
     try {
         $result = makeParam($cmp());
         $line .= "if (" . ($result === "(NAN)" ? "!is_nan($compare)" : "$compare !== $result") . ") { $error }";
-    } catch (Error $e) {
+    } catch (Throwable $e) {
         $msg = makeParam($e->getMessage());
         $line .= "try { $compare; $error } catch (Error \$e) { if (\$e->getMessage() !== $msg) { $error } }";
     }
@@ -138,7 +139,7 @@ function prepareUnaryLine($op, $cmp, $operator) {
     try {
         $result = makeParam($cmp());
         $line .= "if (" . ($result === "(NAN)" ? "!is_nan($compare)" : "$compare !== $result") . ") { $error }";
-    } catch (Error $e) {
+    } catch (Throwable $e) {
         $msg = makeParam($e->getMessage());
         $line .= "try { $compare; $error } catch (Error \$e) { if (\$e->getMessage() !== $msg) { $error } }";
     }

Zend/zend_compile.c

@@ -8992,6 +8992,10 @@ ZEND_API bool zend_binary_op_produces_error(uint32_t opcode, const zval *op1, co
 		/* Division by zero throws an error. */
 		return 1;
 	}
+	if ((opcode == ZEND_POW) && zval_get_long(op1) == 0 && zval_get_double(op2) < 0) {
+		/* 0 ** (<0) throws a division by zero error. */
+		return 1;
+	}
 	if ((opcode == ZEND_SL || opcode == ZEND_SR) && zval_get_long(op2) < 0) {
 		/* Shift by negative number throws an error. */
 		return 1;

Zend/zend_operators.c

@@ -1287,6 +1287,20 @@ ZEND_API zend_result ZEND_FASTCALL mul_function(zval *result, zval *op1, zval *o
 }
 /* }}} */
 
+static void ZEND_COLD zend_power_base_0_exponent_lt_0_error(void)
+{
+	zend_error(E_DEPRECATED, "Power of base 0 and negative exponent is deprecated");
+}
+
+static double safe_pow(double base, double exponent)
+{
+	if (UNEXPECTED(base == 0.0 && exponent < 0.0)) {
+		zend_power_base_0_exponent_lt_0_error();
+	}
+
+	return pow(base, exponent);
+}
+
 static zend_result ZEND_FASTCALL pow_function_base(zval *result, zval *op1, zval *op2) /* {{{ */
 {
 	uint8_t type_pair = TYPE_PAIR(Z_TYPE_P(op1), Z_TYPE_P(op2));
@@ -1311,14 +1325,14 @@ static zend_result ZEND_FASTCALL pow_function_base(zval *result, zval *op1, zval
 					--i;
 					ZEND_SIGNED_MULTIPLY_LONG(l1, l2, l1, dval, overflow);
 					if (overflow) {
-						ZVAL_DOUBLE(result, dval * pow(l2, i));
+						ZVAL_DOUBLE(result, dval * safe_pow(l2, i));
 						return SUCCESS;
 					}
 				} else {
 					i /= 2;
 					ZEND_SIGNED_MULTIPLY_LONG(l2, l2, l2, dval, overflow);
 					if (overflow) {
-						ZVAL_DOUBLE(result, (double)l1 * pow(dval, i));
+						ZVAL_DOUBLE(result, (double)l1 * safe_pow(dval, i));
 						return SUCCESS;
 					}
 				}
@@ -1326,17 +1340,17 @@ static zend_result ZEND_FASTCALL pow_function_base(zval *result, zval *op1, zval
 			/* i == 0 */
 			ZVAL_LONG(result, l1);
 		} else {
-			ZVAL_DOUBLE(result, pow((double)Z_LVAL_P(op1), (double)Z_LVAL_P(op2)));
+			ZVAL_DOUBLE(result, safe_pow((double)Z_LVAL_P(op1), (double)Z_LVAL_P(op2)));
 		}
 		return SUCCESS;
 	} else if (EXPECTED(type_pair == TYPE_PAIR(IS_DOUBLE, IS_DOUBLE))) {
-		ZVAL_DOUBLE(result, pow(Z_DVAL_P(op1), Z_DVAL_P(op2)));
+		ZVAL_DOUBLE(result, safe_pow(Z_DVAL_P(op1), Z_DVAL_P(op2)));
 		return SUCCESS;
 	} else if (EXPECTED(type_pair == TYPE_PAIR(IS_LONG, IS_DOUBLE))) {
-		ZVAL_DOUBLE(result, pow((double)Z_LVAL_P(op1), Z_DVAL_P(op2)));
+		ZVAL_DOUBLE(result, safe_pow((double)Z_LVAL_P(op1), Z_DVAL_P(op2)));
 		return SUCCESS;
 	} else if (EXPECTED(type_pair == TYPE_PAIR(IS_DOUBLE, IS_LONG))) {
-		ZVAL_DOUBLE(result, pow(Z_DVAL_P(op1), (double)Z_LVAL_P(op2)));
+		ZVAL_DOUBLE(result, safe_pow(Z_DVAL_P(op1), (double)Z_LVAL_P(op2)));
 		return SUCCESS;
 	} else {
 		return FAILURE;

ext/standard/basic_functions.stub.php

@@ -3274,6 +3274,11 @@ function fmod(float $num1, float $num2): float {}
  */
 function fdiv(float $num1, float $num2): float {}
 
+/**
+ * @compile-time-eval
+ */
+function fpow(float $num1, float $num2): float {}
+
 /* microtime.c */
 
 #ifdef HAVE_GETTIMEOFDAY

ext/standard/basic_functions_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 1ef54fdebc6a206c4af3438130db0cd12a62c8b6 */
+ * Stub hash: 5d8e13990ce18bebc9c7e6a0a9a7ad8b7593d35b */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_set_time_limit, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, seconds, IS_LONG, 0)
@@ -1732,6 +1732,8 @@ ZEND_END_ARG_INFO()
 
 #define arginfo_fdiv arginfo_fmod
 
+#define arginfo_fpow arginfo_fmod
+
 #if defined(HAVE_GETTIMEOFDAY)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_microtime, 0, 0, MAY_BE_STRING|MAY_BE_DOUBLE)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, as_float, _IS_BOOL, 0, "false")
@@ -2789,6 +2791,7 @@ ZEND_FUNCTION(base_convert);
 ZEND_FUNCTION(number_format);
 ZEND_FUNCTION(fmod);
 ZEND_FUNCTION(fdiv);
+ZEND_FUNCTION(fpow);
 #if defined(HAVE_GETTIMEOFDAY)
 ZEND_FUNCTION(microtime);
 #endif
@@ -3428,6 +3431,7 @@ static const zend_function_entry ext_functions[] = {
 	ZEND_RAW_FENTRY("number_format", zif_number_format, arginfo_number_format, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
 	ZEND_RAW_FENTRY("fmod", zif_fmod, arginfo_fmod, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
 	ZEND_RAW_FENTRY("fdiv", zif_fdiv, arginfo_fdiv, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
+	ZEND_RAW_FENTRY("fpow", zif_fpow, arginfo_fpow, ZEND_ACC_COMPILE_TIME_EVAL, NULL, NULL)
 #if defined(HAVE_GETTIMEOFDAY)
 	ZEND_FE(microtime, arginfo_microtime)
 #endif

ext/standard/math.c

@@ -1389,6 +1389,20 @@ PHP_FUNCTION(fdiv)
 }
 /* }}} */
 
+/* {{{ Perform floating-point exponentiation with IEEE-754 semantics. */
+PHP_FUNCTION(fpow)
+{
+	double base, exponent;
+
+	ZEND_PARSE_PARAMETERS_START(2, 2)
+		Z_PARAM_DOUBLE(base)
+		Z_PARAM_DOUBLE(exponent)
+	ZEND_PARSE_PARAMETERS_END();
+
+	RETURN_DOUBLE(pow(base, exponent));
+}
+/* }}} */
+
 /* {{{ Returns the integer quotient of the division of dividend by divisor */
 PHP_FUNCTION(intdiv)
 {

ext/standard/tests/math/bug45712.phpt

@@ -42,7 +42,7 @@ var_dump($inf==='abc');
 var_dump($inf===$inf);
 
 ?>
---EXPECT--
+--EXPECTF--
 float(NAN)
 bool(true)
 bool(false)
@@ -57,6 +57,8 @@ bool(false)
 bool(false)
 bool(false)
 bool(false)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 float(INF)
 bool(true)
 bool(false)

ext/standard/tests/math/fpow.phpt

@@ -0,0 +1,362 @@
+--TEST--
+fpow() function
+--FILE--
+<?php
+
+$numbers = [
+    0,
+    1,
+    -1,
+    1.0,
+    -1.0,
+    2,
+    -2,
+    2.1,
+    -2.1,
+    0.1,
+    -0.1,
+    0.0,
+    -0.0,
+    10,
+    -10,
+    INF,
+    -INF,
+    NAN,
+];
+
+foreach ($numbers as $base) {
+    foreach ($numbers as $exp) {
+        print str_pad($base, 4, " ", STR_PAD_LEFT) .
+            " ** " .
+            str_pad($exp, 4) .
+            " = " .
+            fpow($base, $exp) .
+            PHP_EOL;
+    }
+}
+?>
+--EXPECT--
+   0 ** 0    = 1
+   0 ** 1    = 0
+   0 ** -1   = INF
+   0 ** 1    = 0
+   0 ** -1   = INF
+   0 ** 2    = 0
+   0 ** -2   = INF
+   0 ** 2.1  = 0
+   0 ** -2.1 = INF
+   0 ** 0.1  = 0
+   0 ** -0.1 = INF
+   0 ** 0    = 1
+   0 ** -0   = 1
+   0 ** 10   = 0
+   0 ** -10  = INF
+   0 ** INF  = 0
+   0 ** -INF = INF
+   0 ** NAN  = NAN
+   1 ** 0    = 1
+   1 ** 1    = 1
+   1 ** -1   = 1
+   1 ** 1    = 1
+   1 ** -1   = 1
+   1 ** 2    = 1
+   1 ** -2   = 1
+   1 ** 2.1  = 1
+   1 ** -2.1 = 1
+   1 ** 0.1  = 1
+   1 ** -0.1 = 1
+   1 ** 0    = 1
+   1 ** -0   = 1
+   1 ** 10   = 1
+   1 ** -10  = 1
+   1 ** INF  = 1
+   1 ** -INF = 1
+   1 ** NAN  = 1
+  -1 ** 0    = 1
+  -1 ** 1    = -1
+  -1 ** -1   = -1
+  -1 ** 1    = -1
+  -1 ** -1   = -1
+  -1 ** 2    = 1
+  -1 ** -2   = 1
+  -1 ** 2.1  = NAN
+  -1 ** -2.1 = NAN
+  -1 ** 0.1  = NAN
+  -1 ** -0.1 = NAN
+  -1 ** 0    = 1
+  -1 ** -0   = 1
+  -1 ** 10   = 1
+  -1 ** -10  = 1
+  -1 ** INF  = 1
+  -1 ** -INF = 1
+  -1 ** NAN  = NAN
+   1 ** 0    = 1
+   1 ** 1    = 1
+   1 ** -1   = 1
+   1 ** 1    = 1
+   1 ** -1   = 1
+   1 ** 2    = 1
+   1 ** -2   = 1
+   1 ** 2.1  = 1
+   1 ** -2.1 = 1
+   1 ** 0.1  = 1
+   1 ** -0.1 = 1
+   1 ** 0    = 1
+   1 ** -0   = 1
+   1 ** 10   = 1
+   1 ** -10  = 1
+   1 ** INF  = 1
+   1 ** -INF = 1
+   1 ** NAN  = 1
+  -1 ** 0    = 1
+  -1 ** 1    = -1
+  -1 ** -1   = -1
+  -1 ** 1    = -1
+  -1 ** -1   = -1
+  -1 ** 2    = 1
+  -1 ** -2   = 1
+  -1 ** 2.1  = NAN
+  -1 ** -2.1 = NAN
+  -1 ** 0.1  = NAN
+  -1 ** -0.1 = NAN
+  -1 ** 0    = 1
+  -1 ** -0   = 1
+  -1 ** 10   = 1
+  -1 ** -10  = 1
+  -1 ** INF  = 1
+  -1 ** -INF = 1
+  -1 ** NAN  = NAN
+   2 ** 0    = 1
+   2 ** 1    = 2
+   2 ** -1   = 0.5
+   2 ** 1    = 2
+   2 ** -1   = 0.5
+   2 ** 2    = 4
+   2 ** -2   = 0.25
+   2 ** 2.1  = 4.2870938501452
+   2 ** -2.1 = 0.2332582478842
+   2 ** 0.1  = 1.0717734625363
+   2 ** -0.1 = 0.93303299153681
+   2 ** 0    = 1
+   2 ** -0   = 1
+   2 ** 10   = 1024
+   2 ** -10  = 0.0009765625
+   2 ** INF  = INF
+   2 ** -INF = 0
+   2 ** NAN  = NAN
+  -2 ** 0    = 1
+  -2 ** 1    = -2
+  -2 ** -1   = -0.5
+  -2 ** 1    = -2
+  -2 ** -1   = -0.5
+  -2 ** 2    = 4
+  -2 ** -2   = 0.25
+  -2 ** 2.1  = NAN
+  -2 ** -2.1 = NAN
+  -2 ** 0.1  = NAN
+  -2 ** -0.1 = NAN
+  -2 ** 0    = 1
+  -2 ** -0   = 1
+  -2 ** 10   = 1024
+  -2 ** -10  = 0.0009765625
+  -2 ** INF  = INF
+  -2 ** -INF = 0
+  -2 ** NAN  = NAN
+ 2.1 ** 0    = 1
+ 2.1 ** 1    = 2.1
+ 2.1 ** -1   = 0.47619047619048
+ 2.1 ** 1    = 2.1
+ 2.1 ** -1   = 0.47619047619048
+ 2.1 ** 2    = 4.41
+ 2.1 ** -2   = 0.22675736961451
+ 2.1 ** 2.1  = 4.7496380917422
+ 2.1 ** -2.1 = 0.21054235726688
+ 2.1 ** 0.1  = 1.0770154403044
+ 2.1 ** -0.1 = 0.92849179554696
+ 2.1 ** 0    = 1
+ 2.1 ** -0   = 1
+ 2.1 ** 10   = 1667.9880978201
+ 2.1 ** -10  = 0.0005995246616609
+ 2.1 ** INF  = INF
+ 2.1 ** -INF = 0
+ 2.1 ** NAN  = NAN
+-2.1 ** 0    = 1
+-2.1 ** 1    = -2.1
+-2.1 ** -1   = -0.47619047619048
+-2.1 ** 1    = -2.1
+-2.1 ** -1   = -0.47619047619048
+-2.1 ** 2    = 4.41
+-2.1 ** -2   = 0.22675736961451
+-2.1 ** 2.1  = NAN
+-2.1 ** -2.1 = NAN
+-2.1 ** 0.1  = NAN
+-2.1 ** -0.1 = NAN
+-2.1 ** 0    = 1
+-2.1 ** -0   = 1
+-2.1 ** 10   = 1667.9880978201
+-2.1 ** -10  = 0.0005995246616609
+-2.1 ** INF  = INF
+-2.1 ** -INF = 0
+-2.1 ** NAN  = NAN
+ 0.1 ** 0    = 1
+ 0.1 ** 1    = 0.1
+ 0.1 ** -1   = 10
+ 0.1 ** 1    = 0.1
+ 0.1 ** -1   = 10
+ 0.1 ** 2    = 0.01
+ 0.1 ** -2   = 100
+ 0.1 ** 2.1  = 0.0079432823472428
+ 0.1 ** -2.1 = 125.89254117942
+ 0.1 ** 0.1  = 0.79432823472428
+ 0.1 ** -0.1 = 1.2589254117942
+ 0.1 ** 0    = 1
+ 0.1 ** -0   = 1
+ 0.1 ** 10   = 1.0E-10
+ 0.1 ** -10  = 10000000000
+ 0.1 ** INF  = 0
+ 0.1 ** -INF = INF
+ 0.1 ** NAN  = NAN
+-0.1 ** 0    = 1
+-0.1 ** 1    = -0.1
+-0.1 ** -1   = -10
+-0.1 ** 1    = -0.1
+-0.1 ** -1   = -10
+-0.1 ** 2    = 0.01
+-0.1 ** -2   = 100
+-0.1 ** 2.1  = NAN
+-0.1 ** -2.1 = NAN
+-0.1 ** 0.1  = NAN
+-0.1 ** -0.1 = NAN
+-0.1 ** 0    = 1
+-0.1 ** -0   = 1
+-0.1 ** 10   = 1.0E-10
+-0.1 ** -10  = 10000000000
+-0.1 ** INF  = 0
+-0.1 ** -INF = INF
+-0.1 ** NAN  = NAN
+   0 ** 0    = 1
+   0 ** 1    = 0
+   0 ** -1   = INF
+   0 ** 1    = 0
+   0 ** -1   = INF
+   0 ** 2    = 0
+   0 ** -2   = INF
+   0 ** 2.1  = 0
+   0 ** -2.1 = INF
+   0 ** 0.1  = 0
+   0 ** -0.1 = INF
+   0 ** 0    = 1
+   0 ** -0   = 1
+   0 ** 10   = 0
+   0 ** -10  = INF
+   0 ** INF  = 0
+   0 ** -INF = INF
+   0 ** NAN  = NAN
+  -0 ** 0    = 1
+  -0 ** 1    = -0
+  -0 ** -1   = -INF
+  -0 ** 1    = -0
+  -0 ** -1   = -INF
+  -0 ** 2    = 0
+  -0 ** -2   = INF
+  -0 ** 2.1  = 0
+  -0 ** -2.1 = INF
+  -0 ** 0.1  = 0
+  -0 ** -0.1 = INF
+  -0 ** 0    = 1
+  -0 ** -0   = 1
+  -0 ** 10   = 0
+  -0 ** -10  = INF
+  -0 ** INF  = 0
+  -0 ** -INF = INF
+  -0 ** NAN  = NAN
+  10 ** 0    = 1
+  10 ** 1    = 10
+  10 ** -1   = 0.1
+  10 ** 1    = 10
+  10 ** -1   = 0.1
+  10 ** 2    = 100
+  10 ** -2   = 0.01
+  10 ** 2.1  = 125.89254117942
+  10 ** -2.1 = 0.0079432823472428
+  10 ** 0.1  = 1.2589254117942
+  10 ** -0.1 = 0.79432823472428
+  10 ** 0    = 1
+  10 ** -0   = 1
+  10 ** 10   = 10000000000
+  10 ** -10  = 1.0E-10
+  10 ** INF  = INF
+  10 ** -INF = 0
+  10 ** NAN  = NAN
+ -10 ** 0    = 1
+ -10 ** 1    = -10
+ -10 ** -1   = -0.1
+ -10 ** 1    = -10
+ -10 ** -1   = -0.1
+ -10 ** 2    = 100
+ -10 ** -2   = 0.01
+ -10 ** 2.1  = NAN
+ -10 ** -2.1 = NAN
+ -10 ** 0.1  = NAN
+ -10 ** -0.1 = NAN
+ -10 ** 0    = 1
+ -10 ** -0   = 1
+ -10 ** 10   = 10000000000
+ -10 ** -10  = 1.0E-10
+ -10 ** INF  = INF
+ -10 ** -INF = 0
+ -10 ** NAN  = NAN
+ INF ** 0    = 1
+ INF ** 1    = INF
+ INF ** -1   = 0
+ INF ** 1    = INF
+ INF ** -1   = 0
+ INF ** 2    = INF
+ INF ** -2   = 0
+ INF ** 2.1  = INF
+ INF ** -2.1 = 0
+ INF ** 0.1  = INF
+ INF ** -0.1 = 0
+ INF ** 0    = 1
+ INF ** -0   = 1
+ INF ** 10   = INF
+ INF ** -10  = 0
+ INF ** INF  = INF
+ INF ** -INF = 0
+ INF ** NAN  = NAN
+-INF ** 0    = 1
+-INF ** 1    = -INF
+-INF ** -1   = -0
+-INF ** 1    = -INF
+-INF ** -1   = -0
+-INF ** 2    = INF
+-INF ** -2   = 0
+-INF ** 2.1  = INF
+-INF ** -2.1 = 0
+-INF ** 0.1  = INF
+-INF ** -0.1 = 0
+-INF ** 0    = 1
+-INF ** -0   = 1
+-INF ** 10   = INF
+-INF ** -10  = 0
+-INF ** INF  = INF
+-INF ** -INF = 0
+-INF ** NAN  = NAN
+ NAN ** 0    = 1
+ NAN ** 1    = NAN
+ NAN ** -1   = NAN
+ NAN ** 1    = NAN
+ NAN ** -1   = NAN
+ NAN ** 2    = NAN
+ NAN ** -2   = NAN
+ NAN ** 2.1  = NAN
+ NAN ** -2.1 = NAN
+ NAN ** 0.1  = NAN
+ NAN ** -0.1 = NAN
+ NAN ** 0    = 1
+ NAN ** -0   = 1
+ NAN ** 10   = NAN
+ NAN ** -10  = NAN
+ NAN ** INF  = NAN
+ NAN ** -INF = NAN
+ NAN ** NAN  = NAN

ext/standard/tests/math/is_finite_basic.phpt

@@ -21,7 +21,8 @@ for ($i = 0; $i < count($values); $i++) {
     var_dump($res);
 }
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
 bool(true)
 bool(true)

ext/standard/tests/math/is_infinite_basic.phpt

@@ -21,7 +21,8 @@ for ($i = 0; $i < count($values); $i++) {
     var_dump($res);
 }
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(false)
 bool(false)
 bool(false)

ext/standard/tests/math/is_nan_basic.phpt

@@ -23,7 +23,8 @@ for ($i = 0; $i < count($values); $i++) {
 }
 
 ?>
---EXPECT--
+--EXPECTF--
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(false)
 bool(false)
 bool(false)

ext/standard/tests/math/pow.phpt

@@ -143,7 +143,7 @@ var_dump(epsilon_equal( LONG_MAX*LONG_MAX , pow(LONG_MAX,2.0) ));
 var_dump(epsilon_equal( LONG_MIN*LONG_MIN , pow(LONG_MIN,2.0) ));
 
 ?>
---EXPECT--
+--EXPECTF--
 1,1,0,0
 bool(true)
 bool(true)
@@ -155,7 +155,11 @@ bool(true)
 bool(true)
 bool(true)
 bool(true)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
 bool(true)
 bool(true)
@@ -180,7 +184,11 @@ bool(true)
 bool(true)
 bool(true)
 bool(true)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
 bool(true)
 bool(true)
@@ -212,7 +220,11 @@ bool(true)
 bool(true)
 bool(true)
 bool(true)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
 bool(true)
 bool(true)
@@ -237,7 +249,11 @@ bool(true)
 bool(true)
 bool(true)
 bool(true)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
 bool(true)
 bool(true)

ext/standard/tests/math/pow_divisionbyzero.phpt

@@ -0,0 +1,122 @@
+--TEST--
+pow() division by zero error
+--FILE--
+<?php
+
+function test() {
+    var_dump(pow(0, -0));
+    var_dump(pow(0.0, -0));
+    var_dump(pow(0, -0.0));
+    var_dump(pow(0.0, -0.0));
+    var_dump(pow(0, -0.01));
+    var_dump(pow(0.0, -0.01));
+    var_dump(pow(0, -1));
+    var_dump(pow(0.0, -1));
+    var_dump(pow(0, -1.1));
+    var_dump(pow(0.0, -1.1));
+
+    var_dump(0 ** -0);
+    var_dump(0.0 ** -0);
+    var_dump(0 ** -0.0);
+    var_dump(0.0 ** -0.0);
+    var_dump(0 ** -0.01);
+    var_dump(0.0 ** -0.01);
+    var_dump(0 ** -1);
+    var_dump(0.0 ** -1);
+    var_dump(0 ** -1.1);
+    var_dump(0.0 ** -1.1);
+}
+
+test();
+test();
+
+?>
+--EXPECTF--
+int(1)
+float(1)
+float(1)
+float(1)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+int(1)
+float(1)
+float(1)
+float(1)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+int(1)
+float(1)
+float(1)
+float(1)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+int(1)
+float(1)
+float(1)
+float(1)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)