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Storing Multiple Elements per Key in an Array in PHP
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Storing Multiple Elements per Key in an Array in PHP

InfinityCoder November 19, 2016

You want to associate multiple elements with a single key.

Store the multiple elements in an array:

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$fruits = array('red' => array('strawberry','apple'),
                'yellow' => array('banana'));

Or use an object:

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while ($obj = mysqli_fetch_assoc($r)) {
    $fruits[] = $obj;
}

In PHP, keys are unique per array, so you can’t associate more than one entry in a key without overwriting the old value. Instead, store your values in an anonymous array:

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$fruits = array();
$fruits['red'][] = 'strawberry';
$fruits['red'][] = 'apple';
$fruits['yellow'][] = 'banana';
 
print_r($fruits);

This prints:

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Array
(
    [red] => Array
    (
            [0] => strawberry
            [1] => apple
    )
 
    [yellow] => Array
          (
            [0] => banana
          )
 
)

Or, if you’re processing items in a loop:

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while (list($color,$fruit) = mysqli_fetch_assoc($r)) {
    $fruits[$color][] = $fruit;
}

To print the entries, loop through the array:

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foreach ($fruits as $color => $color_fruit) {
    // $color_fruit is an array
    foreach ($color_fruit as $fruit) {
        print "$fruit is colored $color.<br>";
    }
}

Or use the array_to_comma_string() function:

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foreach ($fruits as $color => $color_fruit) {
    print "$color colored fruits include " .
       array_to_comma_string($color_fruit) . "<br>";
}

 

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