- Part of the JavaScript String object, charCodeAt() returns the unicode value of the character it found in a string, at the position index you passed as argument (between zero and length-1).
// Notice that the method is case-sensitive:
alert( "a".charCodeAt(0) ); // returns 97
alert( "A".charCodeAt(0) ); // returns 65 - It even works on special, escaped characters, like the Tab key:
alert( "\t".charCodeAt(0) ); // returns 9 - The PHP equivalent to JavaScript's charCodeAt() is the ord() function, which only works for ASCII characters - see PHP's specially-designed multibyte string functions for the rest.
$str = 'A'; // notice uppercase
echo ord( $str ); // returns 65
echo ord( 'a' ); // returns 97 for lowercase 'a' Sister method: charAt() returns the character it found at the position index supplied. And fromCharCode() takes Unicode values as arguments, and returns the corresponding string. Between 0 and 128 (mostly latin alphabet), these code points overlap with ASCII encoding.
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