/** * 函数substr() strrchr() array_pop() strrpos() strpos() strrev() explode() pathinfo() */ function get_ext1($filename) { return strrchr($filename, '.'); } function get_ext2($filename) { return substr($filename, strrpos($filename, '.')); } function get_ext3($filename) { return array_pop(explode('.', $filename)); } function get_ext4($filename) { return pathinfo($filename, PATHINFO_EXTENSION); } function get_ext5($filename) { return strrev(substr(strrev($filename), 0, strpos(strrev($filename), '.'))); } $filename = "1.php"; echo get_ext1($filename) . "\n"; echo get_ext2($filename) . "\n"; echo get_ext3($filename) . "\n"; echo get_ext4($filename) . "\n"; echo get_ext5($filename) . "\n";
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