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PHP | is_numeric() Function

  • Last Updated : 05 Feb, 2021

The is_numeric() function is an inbuilt function in PHP which is used to check whether a variable passed in function as a parameter is a number or a numeric string or not. The function returns a boolean value.

Syntax: 

bool is_numeric ( $var )

Parameters: The function accepts a single parameter which is mandatory and described below: 

  • $var: This input parameter is the variable which the function checks for whether it is a number or a numeric string. Based on this verification, the function returns a boolean value.

Return Value: The function returns TRUE if $var is a number or a numeric string and returns FALSE otherwise.

Examples:  



Input : $var = 12
Output : True

Input : $var = "Geeks for Geeks"
Output : False

Below programs illustrate the is_numeric() function:

Program 1: In this program, a number is passed as input.  

PHP




<?php
 
$num = 12;
if (is_numeric($num)) {
        echo $num . " is numeric";
    }
    else {
        echo $num . " is not numeric";
    }
 
?>
Output: 
12 is numeric

 

Program 2: In this program, a string is passed as input. 

PHP




<?php
 
$element = "Geeks for Geeks";
if (is_numeric($element)) {
        echo $element . " is numeric";
    }
    else {
        echo $element . " is not numeric";
    }
 
?>
Output: 
Geeks for Geeks is not numeric

 

Program 3: In this program, a numeric string is passed as input. 

PHP




<?php
 
$num = "467291";
if (is_numeric($num)) {
        echo $num . " is numeric";
    }
    else {
        echo $num . " is not numeric";
    }
 
?>
Output: 
467291 is numeric

 

Program 4:

PHP




<?php
$array = array(
    "21/06/2018",
    4743,
    0x381,
    01641,
   0b1010010011,
    "Geek Classes"
);
 
foreach ($array as $i) {
    if (is_numeric($i)) {
        echo $i . " is numeric"."\n";
    } else {
        echo $i . " is NOT numeric"."\n";
    }
}
?>
Output: 
21/06/2018 is NOT numeric
4743 is numeric
897 is numeric
929 is numeric
659 is numeric
Geek Classes is NOT numeric

 

Reference: http://php.net/manual/en/function.is-numeric.php
 




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