note 108264 modified in types.comparisons by nikic

[Editor's note: As of PHP 5.4.4 this is no longer true. Integral strings that overflow into floating point numbers will no longer be considered equal.] Be wary of string-comparison where both strings might be interpreted as numbers. Eg: $x="123456789012345678901234567890"; $y="123456789012345678900000000000"; echo ($x==$y)?"equal":"not_equal"; #Prints equal !! Both strings are getting converted to floats, then losing precision, then becoming equal :-( Using "===" or making either of the strings non-numeric will prevent this. [This is on a 32-bit machine, on a 64-bit, you will have to make the strings longer to see the effect] --was-- Be wary of string-comparison where both strings might be interpreted as numbers. Eg: $x="123456789012345678901234567890"; $y="123456789012345678900000000000"; echo ($x==$y)?"equal":"not_equal"; #Prints equal !! Both strings are getting converted to floats, then losing precision, then becoming equal :-( Using "===" or making either of the strings non-numeric will prevent this. [This is on a 32-bit machine, on a 64-bit, you will have to make the strings longer to see the effect] http://php.net/manual/en/types.comparisons.php