Checking if a string contains an integer

Question

Do you know of a function that can check if a string contains an integer?

Here\'s how I\'d expect it to work:

holds_int(\"23\") // should return true         


        

Answer 1

If you use Assert library in you project (https://github.com/beberlei/assert) you can easily do it in one line:

Assertion::integerish($var);

Note: it throws an exception in case of violation the assertion.

Answer 2

If the string contains spaces, then @Jack's answer will not provide accurate result. e.g.

$var = '19   ';
if((string)(int)$var == $var) {
echo 'var is an integer or a string representation of an integer';
}

The above string will not be an int according to the above check.

So instead of using this, try following:

if(ctype_digit(trim('19  '))){
    echo 'it is digit ';
}else{
    echo 'it is not digit ';
}