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Anyone know why in php
var_dump( "cat" == 0 );
Evaluates to true? Also I realize:
var_dump( "cat" === 0 );
has the intended result, but curious as to why the first case would be true. Also this is php 5.3.
The PHP Manual has a type comparison table in it, which gives you an idea of what happens when comparing variables of two different data types.
Your first example (a ‘loose’ comparison since it does not also check the data types of the two operands) implicitly converts the string on the left to an integer. Since it does not start with a number, the string is converted to the integer 0, which is equal to the integer 0.
Your second example compares not only the values but the types as well. Since the type is different, the comparison is false.