Online PHP editor | output for WA6dr

<?php function isPhpKeyword($testString) { // First check it's actually a word and not an expression/number/empty string if (!preg_match('/^[a-z]+$/i', $testString)) { return false; } $tokenised = token_get_all('<?php ' . $testString . '; ?>'); // tokenised[0] = opening PHP tag, tokenised[1] = our test string return reset($tokenised[1]) !== T_STRING; } var_dump( isPhpKeyword('if'), isPhpKeyword('flibble'), isPhpKeyword('while') );