How to check if a variable is a float in PHP?
Which methods are available in PHP to check if a variable is a float or a double? In this tutorial, we are going to see how to check if a variable is a float in PHP.
is_float()
The function is_float($var) returns whether the passed variable is a float or not:
<?php
var_dump( is_float(1.0) ); // true
var_dump( is_float(0.000001) ); // true
var_dump( is_float(0) ); // false
var_dump( is_float(1) ); // false
var_dump( is_float(true) ); // false
var_dump( is_float('1.0') ); // false
var_dump( is_float('hello') ); // false
var_dump( is_float(new stdClass()) ); // false
?>
Output:
bool(true) bool(true) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false)
Test for float parameters
It makes sense to use is_float() to check function parameters:
<?php
function myFunction($val) {
if (!is_float($val)) {
// Error handling(Exception)
}
// ...
}
?>
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