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16 years ago
Simon Neaves was close on explaining why his function is perfect choice for testing for an int (as possibly most people would need).  He made some errors on his ctype_digit() output though - possibly a typo, or maybe a bug in his version of PHP at the time.



The correct output for parts of his examples should be:



<?php

var_dump(ctype_digit(23)); //bool(false)

var_dump(ctype_digit("23")); //bool(true)

var_dump(ctype_digit(23.5)); //bool(false)

var_dump(ctype_digit(NULL)); //bool(false)

var_dump(ctype_digit("")); //bool(false)

?>



As you can see, the reason why using *just* ctype_digit() may not always work is because it only returns TRUE when given a string as input - given a number value and it returns FALSE (which may be unexpected).
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