I'd like to use foreach to loop though an array list and add an element to each array.
$tom = array('aa','bb','cc');
$sally = array('xx','yy','zz');
$myArrays = array('tom','sally');
foreach($myArrays as $arrayName) {
${$arrayName}[] = 'newElement';
}
Is the use of ${$arrayName}[] the best way to do this? Is there another option rather than using curly braces? It currently works but I'm just wondering if there is a better alternative.
Thanks
Use references.
$myArrays = array(&$tom, &$sally);
foreach($myArrays as &$arr) {
$arr[] = 'newElement';
}
$myArrays, otherwise $myArrays[$i] will be copies of $tom and $sally instead of the originals. Technically, it will hold the originals until they are changed, at which point php will copy them.If you're stuck to that structure, I would say stick to what you're doing there. But a comment might be nice.
If you can rearrange things, why not nest them?
$tom = array('aa','bb','cc');
$sally = array('xx','yy','zz');
$myArrays = array(&$tom, &$sally); // store the actual arrays, not names
// note the & for reference, this lets you modify the original array inside the loop
foreach($myArrays as &$array) {
$array[] = 'newElement';
}
No curly braces needed.
$$arrayName[]
The original line is maybe a bug in PHP?
Although I wonder why you would ever need to do this anyway...
Some people will scold you for using variable variables. You could do something like this:
$tom = array('aa','bb','cc');
$sally = array('xx','yy','zz');
$myArrays = array(&$tom, &$sally);
for($i=0; $i<sizeof($myArrays); ++$i) {
$myArrays[$i][] = 'newElement';
}
Not tried, but should work, too:
$tom = array('aa','bb','cc');
$sally = array('xx','yy','zz');
$myArrays = array('tom','sally');
foreach($myArrays as $key => $value) {
$$value[] = 'newElement';
}
