PHP: Hypertext Preprocessor (original) (raw)

iterator_count

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

iterator_count — Count the elements in an iterator

Description

Parameters

iterator

The iterator being counted.

Return Values

The number of elements in iterator.

Examples

Example #1 iterator_count() example

<?php $iterator = new ArrayIterator(array('recipe'=>'pancakes', 'egg', 'milk', 'flour')); var_dump(iterator_count($iterator)); ?>

The above example will output:

Example #2 iterator_count() modifies position

<?php $iterator = new ArrayIterator(['one', 'two', 'three']); var_dump($iterator->current()); var_dump(iterator_count($iterator)); var_dump($iterator->current()); ?>

The above example will output:

string(3) "one" int(3) NULL

Example #3 iterator_count() in foreach loops

<?php $iterator = new ArrayIterator(['one', 'two', 'three']); foreach ($iterator as <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>k</mi><mi>e</mi><mi>y</mi><mo>=</mo><mo>></mo></mrow><annotation encoding="application/x-tex">key => </annotation></semantics></math>key=>value) { echo "$key: <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>v</mi><mi>a</mi><mi>l</mi><mi>u</mi><mi>e</mi><mo stretchy="false">(</mo><mi mathvariant="normal">"</mi><mo separator="true">,</mo><mi>i</mi><mi>t</mi><mi>e</mi><mi>r</mi><mi>a</mi><mi>t</mi><mi>o</mi><msub><mi>r</mi><mi>c</mi></msub><mi>o</mi><mi>u</mi><mi>n</mi><mi>t</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">value (", iterator_count(</annotation></semantics></math>value(",iteratorcount(iterator), ")\n"; }?>

The above example will output:

Found A Problem?

oleksii dot bulba at gmail dot com ¶

3 years ago

`Be aware that counting over NoRewindIterator will make items unavailable:

'pancakes', 'egg', 'milk', 'flour']); iterator=newNoRewindIterator(iterator = new NoRewindIterator(iterator=newNoRewindIterator(iterator);var_dump($iterator->current()); var_dump(iterator_count($iterator)); var_dump($iterator->current()); $iterator->rewind(); // Does not work because it's NoRewindIterator var_dump($iterator->current()); var_dump(iterator_count($iterator));?>

Output:

info at ensostudio dot ru ¶

4 years ago

Safe using: <?php <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>c</mi><mi>n</mi><mi>t</mi><mo>=</mo><mi>i</mi><mi>t</mi><mi>e</mi><mi>r</mi><mi>a</mi><mi>t</mi><mi>o</mi><msub><mi>r</mi><mi>c</mi></msub><mi>o</mi><mi>u</mi><mi>n</mi><mi>t</mi><mo stretchy="false">(</mo><mi>c</mi><mi>l</mi><mi>o</mi><mi>n</mi><mi>e</mi></mrow><annotation encoding="application/x-tex">cnt = iterator_count(clone </annotation></semantics></math>cnt=iteratorcount(cloneiterator); ?>