Cleaner loop through multidimensional array in php

Question

Let's say you have a multidimensional array like so and assume it won:

$Call = array(
    "Foo1" => array(
        "Bar1" => array(
            "Baz1", 
            "Baz2"
        )
    ), 
    "Foo2", 
    "Foo3" => array(
        "Bar2", 
        "Bar3"
    )
);

How would you echo Every Foo, Bar and Baz in the array? I'm particularly having an issue due to Foo2 being set key of 0, so I need to somehow workaround the key being set on values that are not keys.

My current solution, although works, feels too cheat and was wondering if there's cleaner way to loop through the array:

    foreach ($Call as $key => $value) {

            echo "1.".(is_array($value) ? $key : $value)."<br>";

        if(is_array($value)){

            foreach ($value as $key => $value) {

                echo "a.".(is_array($value) ? $key : $value)."<br>";

                if(is_array($value)){

                    foreach ($value as $key => $value) {

                        echo "A.".(is_array($value) ? $key : $value)."<br>";

                    }

                }

            }

        }

    }

What is the expected output for the input you posted?

axiac
– axiac

2018-04-03 10:02:36 +00:00
Commented Apr 3, 2018 at 10:02 — axiac
– axiac, Commented Apr 3, 2018 at 10:02

Tahir Shahzad · Accepted Answer · 2018-04-03 10:50:31Z

1

For a clean code using recursion I have following solution.

$Call= array("Foo1" => array("Bar1" => array("Baz1", "Baz2")), "Foo2", "Foo3" => array("Bar2", "Bar3"));
cleanloop($Call);
function cleanloop($arr){
    foreach($arr as $key => $value){
        if(is_array($value)){
            echo $key . "<br/>";
            cleanloop($value);
        }else{
            echo $value . "<br/>";
        }
    }
}

I hope with a little more effort, listing / numbering can be managed. using html buitl in numbering I can update like

function cleanloop($arr){
    echo "<ol>";
    foreach($arr as $key => $value){
        if(is_array($value)){
            echo "<li>";
            echo $key;
            cleanloop($value);
            echo "</li>";
        }else{
            echo "<li>" . $value . "</li>";
        }
    }
    echo "</ol>";
}

edited Apr 3, 2018 at 10:50

answered Apr 3, 2018 at 10:31

Tahir Shahzad

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Comments

RiWe · Accepted Answer · 2018-04-03 11:42:37Z

It is a matter of taste, but I do not like recursion.

The SPL iterators provide all you need:

<?php
$Call = array(
    "Foo1" => array(
        "Bar1" => array(
            "Baz1",
            "Baz2"
        )
    ),
    "Foo2",
    "Foo3" => array(
        "Bar2",
        "Bar3"
    )
);
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($Call), RecursiveIteratorIterator::SELF_FIRST);
for ($iterator->rewind(); $iterator->valid(); $iterator->next()) {
    echo 'Depth: ';
    echo $iterator->getDepth();
    echo ' Key: ';
    echo $iterator->key();
    echo ' Content: ';
    echo is_array($iterator->current()) ? 'Array' : $iterator->current();
    echo '; ' . PHP_EOL;
}

Please have a look at the constructor of the RecursiveIteratorIterator. It provides some useful flags.

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