PHP detects whether the text box is a number

PHP is_numeric detects whether the variable is a number or a numeric string

Format: bool is_numeric (mixed $var)

If var is a number or numeric string, return TRUE, otherwise return FALSE.

For example 1:

<?php
    $v = is_numeric (&#39;58635272821786587286382824657568871098287278276543219876543&#39;) ? true : false;
    
    var_dump ($v);
?>

The above script will output:

bool(true)

For example 2:

<?php
$str="0";
$strTest=is_numeric(0);
var_dump($strTest);
?>
boolean true

Extension:

is_bool();//Determine whether it is a Boolean type

is_float(); //Determine whether it is a floating point type

is_int(); //Determine whether it is an integer type

is_numeric(); //Determine whether it is a numeric type

is_string(); //Judge whether it is a string

is_array(); //Judge whether it is an array

is_object(); //Judge whether it is an object

Recommended tutorial: PHP video tutorial

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