What is the Quickest Way to Check If All Values in an Array Are Numeric?

assuming your array is one-dimensional and just made up of integers:

return ctype_digit(implode('',$array));

Filter the array using is_numeric. If the size of the result is the same as the original, then all items are numeric:

$array = array( 1, '2', '45' );
if ( count( $array ) === count( array_filter( $array, 'is_numeric' ) ) ) {
    // all numeric
}

array_map("is_numeric", array(1,2,"3","hello"))

Array ( [0] => 1 [1] => 1 [2] => 1 [3] => )

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