Fixed bug #44929 - Better handling of leading zeros

This is obviously not going to work for Unicode strings, but the whole
function needs to be rewritten, so keep it in synch with the other
branches for now.

ext/standard/strnatcmp.c

@@ -112,10 +112,10 @@ PHPAPI int strnatcmp_ex(char const *a, size_t a_len, char const *b, size_t b_len
 		ca = a[ai]; cb = b[bi];
 
 		/* skip over leading spaces or zeros */
-		while (isspace((int)(unsigned char)ca))
+		while (isspace((int)(unsigned char)ca) || (ca == '0' && ap+1 < aend))
 			ca = a[++ai];
 
-		while (isspace((int)(unsigned char)cb))
+		while (isspace((int)(unsigned char)cb) || (cb == '0' && bp+1 < bend))
 			cb = b[++bi];
 
 		/* process run of digits */

ext/standard/tests/array/bug44929.phpt

@@ -0,0 +1,31 @@
+--TEST--
+Bug #44929 (natsort doesn't handle leading zeros well)
+--FILE--
+<?php
+$a = array('001','008','005','00011','03','000014','-123','0.002','00','0');
+natsort($a);
+var_dump($a);
+?>
+--EXPECT--
+array(10) {
+  [6]=>
+  string(4) "-123"
+  [7]=>
+  string(5) "0.002"
+  [8]=>
+  string(2) "00"
+  [9]=>
+  string(1) "0"
+  [0]=>
+  string(3) "001"
+  [4]=>
+  string(2) "03"
+  [2]=>
+  string(3) "005"
+  [1]=>
+  string(3) "008"
+  [3]=>
+  string(5) "00011"
+  [5]=>
+  string(6) "000014"
+}