Online PHP editor | output for YoLVf

@ 2013-08-24T06:11:32Z

<?php

function encrypt($string) {
		$pad = 'abcde';
		$encrypted_string = "";
		for ($i = 0; $i < strlen($string); $i++) {
			$char = $string[$i];
			$ord_shift = ctype_upper($shift_char) ? 65 : 97;
			if ($i < strlen($pad) && preg_match("/[a-z]/i", $char)) {
				$shift_char = $pad[$i];
				$shift_amount = ord($shift_char) - $ord_shift;

				if ($shift_amount) {
					$ord_char = ord($char) + $shift_amount;

					while ($ord_char > $ord_shift + 26) {
						$ord_char -= 26;
					}

					$char = chr($ord_char);

				}
			}
			$encrypted_string .= $char;
		}
		return $encrypted_string;
	}

encrypt('this is a test');

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Warning: Undefined variable $shift_char in /in/YoLVf on line 8 Deprecated: ctype_upper(): Argument of type null will be interpreted as string in the future in /in/YoLVf on line 8
Output for 8.0.0 - 8.0.30: Warning: Undefined variable $shift_char in /in/YoLVf on line 8
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33: Notice: Undefined variable: shift_char in /in/YoLVf on line 8
Output for 7.3.32 - 7.3.33, 7.4.26
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3: Notice: Undefined variable: shift_char in /in/YoLVf on line 8

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