php字符串如何转为16进制字符串

/** **字符串转16进制 **/ public function String2Hex($string){ $hex=''; for ($i=0; $i < strlen($string); $i++){ $hex .= dechex(ord($string[$i])); } return $hex; } /** **16进制转字符串 **/ public function Hex2String($hex){ $string=''; for ($i=0; $i < strlen($hex)-1; $i+=2){ $string .= chr(hexdec($hex[$i].$hex[$i+1])); } return $string; } // example: $hex = String2Hex("test sentence..."); // $hex contains 746573742073656e74656e63652e2e2e echo Hex2String($hex); // outputs: test sentenc

public function String2Hex($string){ $hex=''; // for ($i=0; $i < strlen($string); $i++){ // $hex .= dechex(ord($string[$i])); // } $hex = bin2hex($string); return $hex; }