is_int function to check a integer in PHP

Check the PHP type with is_int()

is_int() checks the variable type. A form value such as '25' is a string even though it contains digits, so validate or convert external input before expecting is_int() to return true.

$a = 25;
$b = '25';

var_dump(is_int($a)); // true
var_dump(is_int($b)); // false

This is the recommended starting pattern. The detailed examples below are retained for explanation, comparison and related variations.

For True output is 1 , For False no output will be generated.

<?php
$var=5;
echo is_int($var); // Output 1 
echo "<br>";
$var='5';
echo is_int($var); // No Output  
echo "<br>";
$var=5.8;
echo is_int($var); // No output (for Float)  
echo "<br>";
$var=+5;
echo is_int($var); // Output 1 
echo "<br>";
$var=-5;
echo is_int($var); // Output 1 
echo "<br>";
$var='a123';
echo is_int($var); // No output  
echo "<br>";
?>

Difference between is_numeric and is_int

if the variable stores integer as string that then is_int() will return false. Here is an example.

$var="123";
if(is_int($var)){
echo " this is an integer ";
}else{
echo " this is not an integer ";}

Above code will say this is not an integer
But in above case is_numeric will identify this as an integer. Note that if we are using any form data as input then all numeric data also treated as string. Here is an example.

$var=$_POST['t1'];
if(is_int($var)){
echo " this is an integer ";
}else{
echo " this is not an integer ";
}

We can create an form to post data to the above code like this

<form method=post action=is_int1.php>
<input type=text name=t1>
<input type=submit value=submit>

In the above form if we post an integer then also is_int will return false.
ctype_digit() FILTER_VALIDATE_INT() is_numeric() intval(): Integer output
PHP Form

Subhendu Mohapatra

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gen	13-07-2012
how about is not numeric???

is_int() : check integer

Check the PHP type with is_int()

Difference between is_numeric and is_int

Subhendu Mohapatra