How Can I Efficiently Iterate Through Two Arrays Simultaneously in PHP?

How can I loop through two arrays at once? [duplicate]

Problem

The problem lies in your nested foreach loop, which iterates over the entire $data2 array for each element of the $data1 array. This results in a total of $data1 * $data2 iterations.

Solutions

array_map() method (PHP >=5.3)

array_map(function($v1, $v2){
    echo $v1 . "<br>";
    echo $v2 . "<strong><br><br></strong>";
}, $data1, $data2 /* , Add more arrays if needed manually */);

MultipleIterator method (PHP >=5.3)

$it = new MultipleIterator();
$it->attachIterator(new ArrayIterator($data1));
$it->attachIterator(new ArrayIterator($data2));
//Add more arrays if needed

foreach($it as $a) {
    echo $a[0] . "<br>";
    echo $a[1] . "<strong><br><br></strong>";
}

for loop method (PHP >=4.3)

$keysOne = array_keys($data1);
$keysTwo = array_keys($data2);

$min = min(count($data1), count($data2));

for($i = 0; $i < $min; $i++) {
    echo $data1[$keysOne[$i]] . "<br>";
    echo $data2[$keysTwo[$i]] . "<strong><br><br></strong>";
}

array_combine() method (PHP >=5.0)

foreach(array_combine($data1, $data2) as $d1 => $d2) {
    echo $d1 . "<br>";
    echo $d2 . "<strong><br><br></strong>";
}

call_user_func_array() method (PHP >=5.6)

$func = function(...$numbers){
    foreach($numbers as $v)
        echo $v . "<br>";
    echo "<strong><br></strong>";
};
call_user_func_array("array_map", [$func, $data1, $data2]);

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