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<?php

$notFloat = '8521';

//example 1:
var_dump(is_float($notFloat)); //bool(false)
//example 2:
var_dump(filter_var($notFloat, FILTER_VALIDATE_FLOAT)); //float(8521) 
//example 3:
var_dump(is_float(filter_var($notFloat, FILTER_VALIDATE_FLOAT))); //bool(true)

//the example 3 was found at Respect\Validation\Rules\Float.php


 
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