PHP: is_numeric() function


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


(PHP 4 and above)


is_numeric (var_name)


Name Description Required /
var_name The variable being checked Required Mixed*

*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.


if (is_numeric($var_name1))
echo "$var_name1 is Numeric.<br>" ;
echo "$var_name1 is not Numeric. <br>" ;
if (is_numeric($var_name2))
echo "$var_name2 is Numeric.<br>" ;
echo "$var_name2 is not Numeric.<br>" ;
echo "[ $var_name3 is numeric? ]" .var_dump($result)."<br>";
echo "[ $var_name4 is numeric? ]" .var_dump($result)."<br>";
echo "[ $var_name5 is numeric? ]" .var_dump($result)."<br>";
echo "[ $var_name6 is numeric? ]" .var_dump($result)."<br>";
echo "[ $var_name7 is numeric? ]" .var_dump($result);


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? ]

View the example in the browser

Practice here online :

See also

PHP Function Reference

Previous: is_null
Next: is_object

PHP: Tips of the Day

PHP - how to create a newline character?

Only double quoted strings interpret the escape sequences \r and \n as '0x0D' and '0x0A' respectively, so you want:


Single quoted strings, on the other hand, only know the escape sequences \\ and \'.

So unless you concatenate the single quoted string with a line break generated elsewhere (e. g., using double quoted string "\r\n" or using chr function chr(0x0D).chr(0x0A)), the only other way to have a line break within a single quoted string is to literally type it with your editor:

$s = 'some text before the line break
some text after';

Make sure to check your editor for its line break settings if you require some specific character sequence (\r\n for example).

Ref : https://bit.ly/3hcyege