PHPst PHPst - 3 months ago 10
PHP Question

Converting multi-dimensional array to a single HTML-like array?

What is the fastest or most convenient possible way to convert a multi-dimensional array to a single HTML-like array (the method that is used to set the

name
attribute in HTML forms)? For example,

$ar = [
'x' => ['a' => 1, 'b' => 2, 'c' => 3],
'y' => ['yy' => ['yyy' => 3]],
'z' => 3333,
'm' => [1, 2],
];


should be converted to:

$ar = [
'x[a]' => 1,
'x[b]' => 2,
'x[c]' => 3,
'y[yy][yyy]' => 3,
'z' => 3333,
'm[0]' => 1,
'm[1]' => 2,
];


Here is my first try:

$ar = [
'x' => ['a' => 1, 'b' => 2, 'c' => 3],
'y' => ['yy' => ['yyy' => '3']],
'z' => 3333,
'm' => [1, 'x']
];

function convert($key, $value, &$new)
{
foreach ($value as $k => $v) {
if (is_array($v)) {
convert($key."[$k]", $v, $new);
}
else {
$new[$key."[$k]"] = $v;
}
}
}
$r = [];
convert(null, $ar, $r);
print_r($r);;

Answer

I do not know about speed, but this is a convenient way to do the trick:

$ar = convert_array( $ar );

function convert_array( $a, $key = '' ) {
    static $arr = array();
    foreach( $a as $k => $v ) {
        $key_name = $key == '' ? $k : $key . '[' . $k . ']';
        if ( is_array( $v) ) {
            convert_array( $v, $key_name );
        } else {
            $arr[$key_name] = $v;
        }
    }
    return $arr;
}
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