PHP: is_numeric() function

Description

The is_numeric() function is used to check whether a variable is numeric or not.

Version:

(PHP 4 and above)

Syntax:

is_numeric (var_name)

Parameter:

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value:

TRUE if var_name is a number or a numeric string, FALSE otherwise.

Value Type: Boolean.

Example:

<?php
$var_name1=678;
$var_name2="a678";
$var_name3="678";
$var_name4="W3resource.com";
$var_name5=698.99;
$var_name6=array("a1","a2");
$var_name7=+125689.66;
if (is_numeric($var_name1))
{
echo "$var_name1 is Numeric.<br>" ;
}
else
{
echo "$var_name1 is not Numeric. <br>" ;
}
if (is_numeric($var_name2))
{
echo "$var_name2 is Numeric.<br>" ;
}
else
{
echo "$var_name2 is not Numeric.<br>" ;
}
$result=is_numeric($var_name3);
echo "[ $var_name3 is numeric? ]" .var_dump($result)."<br>";
$result=is_numeric($var_name4);
echo "[ $var_name4 is numeric? ]" .var_dump($result)."<br>";
$result=is_numeric($var_name5);
echo "[ $var_name5 is numeric? ]" .var_dump($result)."<br>";
$result=is_numeric($var_name6);
echo "[ $var_name6 is numeric? ]" .var_dump($result)."<br>";
$result=is_numeric($var_name7);
echo "[ $var_name7 is numeric? ]" .var_dump($result);
?>

Output:

678 is Numeric.
a678 is not Numeric.
bool(true)  [ 678 is numeric? ]
bool(false)  [ W3resource.com is numeric? ]
bool(true)  [ 698.99 is numeric? ]
bool(false)  [ Array is numeric? ]
bool(true)  [ 125689.66 is numeric? ]

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Practice here online :

See also

PHP Function Reference

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