Notice:
the complexity of array_pop() is O(1).
the complexity of array_shift() is O(n).
array_shift() requires a re-index process on the array, so it has to run over all the elements and index them.(PHP 4, PHP 5, PHP 7, PHP 8)
array_pop — Dizinin sonundaki elemanı diziden çıkartır
array_pop() dizi'deki son
elemanı çıkartır ve son elemanın değerini döndürür,
dizi bir eleman kısalır.
Bilginize:
Bu işlev diziyi kullandıktan sonra girdi dizisinin dahili göstericisini ilk elemana konumlandırır.
diziDeğer alınacak dizi.
dizi'nin son elemanının değerini döndürür.
Eğer dizi boş ise null değer döndürür.
Örnek 1 - array_pop() örneği
<?php
$depo = array("portakal", "muz", "elma", "ahududu");
$meyve = array_pop($depo);
print_r($depo);
?>Bundan sonra, $depo üç elemana sahiptir:
Array
(
[0] => portakal
[1] => muz
[2] => elma
)
Ve ahududu $meyve değişkenine
atanmıştır.
Notice:
the complexity of array_pop() is O(1).
the complexity of array_shift() is O(n).
array_shift() requires a re-index process on the array, so it has to run over all the elements and index them.Note that array_pop doesn't issue ANY warning or error if the array is already empty when you try to pop something from it. This is bizarre! And it will cause cascades of errors that are hard to resolve without knowing the real cause.
Rather than an error, it silently returns a NULL object, it appears, so in my case I ended up with warnings elsewhere about accessing elements of arrays with invalid indexes, as I was expecting to have popped an array. This behaviour (and the lack of any warning, when many trivial things are complained about verbosely) is NOT noted in the manual above. Popping an already empty stack should definitely trigger some sort of notice, to help debugging.
Sure, it's probably good practice to wrap the pop in an if (count($array)) but that should be suggested in the manual, if there's no error returned for trying something that should fail and obviously isn't expected to return a meaningful result.I wrote a simple function to perform an intersect on multiple (unlimited) arrays.
Pass an array containing all the arrays you want to compare, along with what key to match by.
<?php
function multipleArrayIntersect($arrayOfArrays, $matchKey)
{
$compareArray = array_pop($arrayOfArrays);
foreach($compareArray AS $key => $valueArray){
foreach($arrayOfArrays AS $subArray => $contents){
if (!in_array($compareArray[$key][$matchKey], $contents)){
unset($compareArray[$key]);
}
}
}
return $compareArray;
}
?>