(PHP 7 >= 7.1.0, PHP 8) is_iterable — Verify that the contents of a variable is an iterable value Descriptionis_iterable(mixed $value):
bool Parameters value The value to check Return Values Returns true if value is iterable, false otherwise. ExamplesExample #1
is_iterable() examples
<?php
var_dump
(is_iterable([1, 2, 3])); // bool(true)
var_dump(is_iterable(new ArrayIterator([1, 2, 3]))); // bool(true)
var_dump(is_iterable((function () { yield 1; })())); // bool(true)
var_dump(is_iterable(1)); // bool(false)
var_dump(is_iterable(new stdClass())); // bool(false)?>
See Also- is_array() - Finds whether a variable is an array
mopsyd at me dot com ¶ 4 years ago
A slight correction to brcontainer's polyfill, which prevents errors on a non-object in a non-blocking way, and also corrects the issue of the conditional checking "file_exists" instead of the correct "function_exists":
if ( !function_exists( 'is_iterable' ) )
{
function is_iterable( $obj )
{
return is_array( $obj ) || ( is_object( $obj ) && ( $obj instanceof \Traversable ) );
}
}
The original answer would not have resolved correctly, because it was looking for a file instead of a function, and the provided method would error if given a non-iterable non-object value such as false.
brcontainer at yahoo dot com dot br
¶
4 years ago
Polyfill for PHP5.6 and PHP7.0
if (!file_exists('is_iterable')) {
function is_iterable($obj)
{
return is_array($obj) || $obj instanceof \Traversable;
}
}
❮ PHP Variable Handling Reference ExampleCheck whether the contents of a variable is an iterable value or not: <?php
$a = "Hello";
echo "a is " . is_iterable($a) . "<br>"; $b = array("red", "green", "blue");
echo "b is " . is_iterable($b) . "<br>"; $c = array("Peter"=>"35",
"Ben"=>"37", "Joe"=>"43");
echo "c is " . is_iterable($c) . "<br>"; $d = [1, 2, 3];
echo "d is " . is_iterable($d) . "<br>";
?> Try it Yourself »
Definition and UsageThe is_iterable() function checks whether the contents of a variable is an iterable value or not. This function returns true (1) if the variable
is iterable, otherwise it returns false/nothing.
SyntaxParameter Values
| Parameter | Description |
|---|
| variable
| Required. Specifies the variable to check
|
Technical Details
| Return Value: | TRUE if variable is iterable, FALSE otherwise
|
|---|
| Return Type: | Boolean
|
|---|
| PHP Version: | 7.1+
|
|---|
❮ PHP Variable Handling Reference
View Discussion Improve Article Save Article ReadDiscussView Discussion Improve Article Save Article The is_iterable() function is an inbuilt function in PHP which is used to check whether the contents of a variable is an iterable
value or not. Syntax: bool is_iterable( mixed $var ) Parameters: This function accepts single parameter as mentioned above and described below: - $var: It contains the value of variable that need to be check.
Return Value: It returns TRUE if the value of variable is iterable, FALSE otherwise. Program 1: <?php
$arr = array(1, 2, 3, 4, 5);
if(is_iterable($arr)) {
echo "Array is iterable";
}
else {
echo "Array is not iterable";
}
class GFG {
}
$obj = new GFG();
if(is_iterable($obj)) {
echo "\nObject is iterable";
}
else {
echo "\nObject is not iterable";
}
?>
Output: Array is iterable
Object is not iterable Program 2: <?php
class GFG {
public $Geek_name = "Welcome to GeeksforGeeks";
}
$obj = new GFG();
var_dump(is_iterable($obj));
$arr = array('G', 'e', 'e', 'k', 's');
var_dump(is_iterable($arr));
$num = 25;
var_dump(is_iterable($num));
$str = "GeeksforGeeks";
var_dump(is_iterable($str));
$bool
= true;
var_dump(is_iterable($bool));
?>
Output: bool(false)
bool(true)
bool(false)
bool(false)
bool(false) Reference: https://www.php.net/manual/en/function.is-iterable.php
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