How to count all array elements in PHP ?
We have given an array containing some array elements and the task is to count all elements of an array arr using PHP. In order to do this task, we have the following methods in PHP:
Table of Content
- Using count() Method
- Using sizeof() Method
- Using a loop
- Using iterator_count with ArrayIterator
Using count() Method
The count() method is used to count the current elements in an array. It returns 0 for an empty array.
Syntax:
count($array, mode)
Example :
<?php
// PHP program to count all elements
// or values in an array
// Use of count() function
$array = array("Geek1", "Geek2",
"Geek3", "1", "2","3");
echo "Count first array elements: " . count($array) . "\n";
$array = array(
'names' => array("Geek1", "Geek2", "Geek3"),
'rank' => array('1', '2', '3')
);
echo "Recursive count: " . count($array, 1) . "\n";
echo "Normal count: " . count($array, 0);
?>
Output
Count first array elements: 6 Recursive count: 8 Normal count: 2
Using sizeof() Method
The sizeof() method is used to count the number of elements present in an array or any other countable object.
Syntax:
sizeof($array, mode)
Example :
<?php
// PHP program to count all elements
// or values in an array
// Use of sizeof() function
$array = array("Geek1", "Geek2",
"Geek3", "1", "2","3");
echo "Count second array elements: "
. sizeof($array) . "\n";
$array = array(
'names' => array("Geek1", "Geek2", "Geek3"),
'rank' => array('1', '2', '3')
);
echo("Recursive count: " . sizeof($array, 1) . "\n");
echo("Normal count: " . sizeof($array, 0) . "\n");
?>
Output
Count second array elements: 6 Recursive count: 8 Normal count: 2
Using a loop
To count all array elements in PHP using a loop, initialize a counter variable to zero. Iterate through the array elements using a loop and increment the counter for each element. The final count represents the total number of elements.
Example
<?php
// Single-dimensional array
$array = array("Geek1", "Geek2", "Geek3", "1", "2", "3");
$count = 0;
foreach ($array as $element) {
$count++;
}
echo "Count first array elements: $count \n";
// Multi-dimensional array
$array = array(
'names' => array("Geek1", "Geek2", "Geek3"),
'rank' => array('1', '2', '3')
);
// Recursive count
$count = 0;
foreach ($array as $subarray) {
foreach ($subarray as $element) {
$count++;
}
}
echo "Recursive count: $count \n";
// Normal count
echo "Normal count: " . count($array) . "\n";
?>
Output
Count first array elements: 6 Recursive count: 6 Normal count: 2
Using iterator_count with ArrayIterator
Using iterator_count with ArrayIterator involves wrapping the array in an ArrayIterator object, which provides a way to traverse the array. The iterator_count function then counts the elements of this iterator, giving the total number of elements in the array.
Example:
<?php
$array = [1, 2, 3, 4, 5];
$iterator = new ArrayIterator($array);
$count = iterator_count($iterator);
echo "Number of elements: $count";
?>
Output
Number of elements: 5
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