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ctype_alnum

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PHP ctype_alnum to Check Alpha Numeric Characters

By Ed Reckers on August 2, 2007

A function of PHP’s; ctype_alnum can be used to test a string for alpha numeric characters. It will count a space as non-alphanumeric (which is right), so you can use it like so: $string = “test !ng”; if ( !ctype_alnum(preg_replace(‘/[[:space:]]/’, ”, $string)) ) echo “stringy baddy” That’s about it. Funny thing is that it takes [...]

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