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PHP is_numeric() function usage and example

PHP available functions

is_numeric() The function is used to check whether a variable is a number or a numeric string.

PHP version requirement: PHP 4, PHP 5, PHP 7

Syntax

bool is_numeric ( mixed $var )

Parameter description:

$var: The variable to be checked.

Return value

If the specified variable is a number or a numeric string, it returns TRUE; otherwise, it returns FALSE.

Online example

Example

<?php
$var_name1=678;
$var_name2="a678";
$var_name3="678";
$var_name4="oldtoolbag.com";
$var_name5=698.99;
$var_name6=array("a1","a2");
$var_name7=+125689.66;
if (is_numeric($var_name1))
{
    echo "$var_name1 Is a number" . PHP_EOL;
}
else
{
    echo "$var_name1 Not a number" . PHP_EOL ;
}
if (is_numeric($var_name2))
{
    echo "$var_name2 Is a number" . PHP_EOL ;
}
else
{
    echo "$var_name2 Not a number" . PHP_EOL ;
}
$result=is_numeric($var_name3);
echo "[ $var_name3 Is it a number? ]" .var_dump($result) . PHP_EOL;
$result=is_numeric($var_name4);
echo "[ $var_name4 Is it a number? ]" .var_dump($result) . PHP_EOL;
$result=is_numeric($var_name5);
echo "[ $var_name5 Is it a number? ]" .var_dump($result) . PHP_EOL;
$result=is_numeric($var_name6);
echo "[ $var_name6 Is it a number? ]" .var_dump($result) . PHP_EOL;
$result=is_numeric($var_name7);
echo "[ $var_name7 Is it a number? ]" .var_dump($result);
?>

The output result is:

678 Is a number
a678 Not a number
bool(true)
[ 678 Is it a number? ]
bool(false)
[ oldtoolbag.com Is it a number? ]
bool(true)
[ 698.99 Is it a number? ]
bool(false)
[ Array Is it a number? ]
bool(true)
[ 125689.66 Is it a number? ]

PHP available functions

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