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<?php $arr = ['one', 'two', 'three', 'four', 'five']; echo 'foreach on $arr' . PHP_EOL; foreach($arr as $elem) { var_dump(current($arr)); } echo PHP_EOL . 'foreach on $refArr' . PHP_EOL; $refArr = &$arr; foreach($refArr as $elem) { var_dump(current($arr)); } echo 'substituting array during iteration' . PHP_EOL; $refArr = &$arr; foreach($refArr as $elem) { if ($elem == 'three') { $arr = [1, 2, 3, 4, 5]; } echo $elem . PHP_EOL; }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
foreach on $arr string(3) "one" string(3) "one" string(3) "one" string(3) "one" string(3) "one" foreach on $refArr string(3) "one" string(3) "one" string(3) "one" string(3) "one" string(3) "one" substituting array during iteration one two three four five
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 foreach on $arr string(3) "one" string(3) "one" string(3) "one" string(3) "one" string(3) "one" foreach on $refArr string(3) "one" string(3) "one" string(3) "one" string(3) "one" string(3) "one" substituting array during iteration one two three four five
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
foreach on $arr string(3) "two" string(3) "two" string(3) "two" string(3) "two" string(3) "two" foreach on $refArr string(3) "two" string(5) "three" string(4) "four" string(4) "five" bool(false) substituting array during iteration one two three 1 2 3 4 5
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/TNPNb on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/TNPNb on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/TNPNb on line 3
Process exited with code 255.
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