Very illogical php value comparisons -

I stumbled on a very strange bit of PHP code. Can anyone explain why this is happening? ***** Bonus Points ***** If you can tell me why this is useful.

  & lt ;? Php if (0 == 'a') {Print ord (0). "Should never be equal" .ord ('a') "& Lt; br & gt;"; } If (false == 0) {print "false == 0 
"; } If ('a' == wrong) {print "a == wrong 
"; }? & Gt;  

and the resulting output:

  48 should never be equal to 9 97 == 0  

In PHP, 'a' is not ASCII character, but string a In a numerical context, this is equal to 0. For example, the value of intval ('a') is returned in the value of 0 .

This is useful because PHP is mainly used for text processing, and may want to test any test (123 == '123'), which is true. And given that in the singular (or double) quotation marks, a number is considered as a number, it is not a number for the string, whose numeric value is not considered as anything other than 0.

Oh, yes, one more thing. 'A' is true in Boolean context, I do not believe it makes some type of text processing more natural, but I can not honestly think of an example in this late time.