is number hex() problem

[otuatail]

Can anyone tell me if there is a function to check if a number is hex-decimal. For security reasons, I am using hex and md5() which produces a 32 character hex value. This might be require a regx expression but not good at regx.

 

Thanks.

 

Desmond.

 

[salathe]

You can use ctype_xdigit to check for only hex characters and then also check that the string is 32 characters long.

 

if (ctype_xdigit($md5) && strlen($md5) === 32) {
    // Yay
}

[otuatail]

thanks. Bit confused over the extra = iv

=== 32

 

Desmond

 

[runnerjp]

typo i belive... should be

 

if (ctype_xdigit($md5) && strlen($md5) == 32) {    // Yay}

 

just shing is the code equal to 32 char (strlen) long

[otuatail]

Ok thanks for that. Good work

 

Desmond.

 

[Adam]

It's not a typo. "===" performs an 'identical' comparison, meaning it compares the data type too.

 

http://php.net/manual/en/language.operators.comparison.php

[salathe]

typo i belive... should be

 

Not a typo at all. As Mr Adam said, it's the identical comparison operator.