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run code in 200+ php & hhvm versions
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<?php $letter = 'z'; print_r(array_filter(get_defined_functions()['internal'], function($function) {return $function[0] == $GLOBALS['letter'];}));
Output for 7.3.0beta1 - 7.3.0rc4
Array ( [0] => zend_version [142] => zlib_encode [143] => zlib_decode [144] => zlib_get_coding_type )
Output for 7.1.20, 7.2.6 - 7.3.0alpha1
Array ( [0] => zend_version [141] => zlib_encode [142] => zlib_decode [143] => zlib_get_coding_type )
Output for 7.2.0
Array ( [0] => zend_version [197] => zlib_encode [198] => zlib_decode [199] => zlib_get_coding_type )
Output for 7.1.0 - 7.1.10
Array ( [0] => zend_version [196] => zlib_encode [197] => zlib_decode [198] => zlib_get_coding_type )
Output for 7.0.0 - 7.0.20
Array ( [0] => zend_version [195] => zlib_encode [196] => zlib_decode [197] => zlib_get_coding_type )
Output for 5.6.0 - 5.6.28
Array ( [0] => zend_version [199] => zlib_encode [200] => zlib_decode [201] => zlib_get_coding_type )
Output for 5.5.0 - 5.5.38
Array ( [0] => zend_version [193] => zlib_encode [194] => zlib_decode [195] => zlib_get_coding_type )
Output for 5.4.15 - 5.4.45
Array ( [0] => zend_version [190] => zlib_encode [191] => zlib_decode [192] => zlib_get_coding_type [636] => zend_logo_guid )
Output for 5.4.1 - 5.4.14
Array ( [0] => zend_version [143] => zlib_encode [144] => zlib_decode [145] => zlib_get_coding_type [589] => zend_logo_guid )
Output for 5.4.0
Array ( [0] => zend_version [143] => zlib_encode [144] => zlib_decode [145] => zlib_get_coding_type [588] => zend_logo_guid )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/0K98D on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/0K98D on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0K98D on line 5
Process exited with code 255.