startsWith():
function startsWith($haystack, $needle){ return strncmp($haystack, $needle, strlen($needle)) === 0; }
endsWith():
function endsWith($haystack, $needle){ return $needle === ‘‘ || substr_compare($haystack, $needle, -strlen($needle)) === 0; }
参考：https://www.gowhich.com/blog/747
https://leonax.net/p/7804/string-startswith-and-endswith-in-php/
原文：https://www.cnblogs.com/tommy-huang/p/9357631.html