note 125758 deleted from language.operators.comparison by crell

Note Submitter: yiminrong at yahoo dot ca ---- The string equality operator has a big gotcha in that if both operators match the format /^0+[Ee][0-9]+$/, then the values will be considered equal. All these, which represent common use cases, will output true: echo '0e56' == '0E31'; // comparing short hex strings echo md5('240610708') == md5('QNKCDZO'); // comparing hashes - see comment by Ray Paseur in md5 function echo '000e123' == '00e0123'; // permutation of a string The reason is that strings in the format /^0+[Ee][0-9]+$/ are interpreted as a number in scientific notation and zero raised to any power is zero. Unless it is certain that the string will not match the specific format, then === should be used instead of == for strings.