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<?php $letter = 'z'; print_r(array_filter(get_defined_functions()['internal'], function($function) {return $function[0] == $GLOBALS['letter'];}));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => zend_version [125] => zlib_get_coding_type [129] => zlib_encode [130] => zlib_decode )

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