PHP числовая строка
/*
The PHP is_numeric() function can be used to find whether a variable is
numeric. The function returns true if the variable is a number or a
numeric string, false otherwise.
*/
#How to check if the variable is numeric
<?php
$x = 24523;
var_dump(is_numeric($x));
$x = "24523";
var_dump(is_numeric($x));
$x = "124.14" + 100;
var_dump(is_numeric($x));
$x = "Random Text";
var_dump(is_numeric($x));
?>
/*This outputs
bool(true)
bool(true)
bool(true)
bool(false)
*/
Rick Astley