PHP array_slice() Funksie
Voorbeeld
Begin die sny vanaf die derde skikkingselement, en gee die res van die elemente in die skikking terug:
<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,2));
?>
Definisie en gebruik
Die array_slice()-funksie gee geselekteerde dele van 'n skikking terug.
Let wel: As die skikking stringsleutels het, sal die teruggestuurde skikking altyd die sleutels bewaar (Sien voorbeeld 4).
Sintaksis
array_slice(array, start, length, preserve)
Parameterwaardes
| Parameter | Description |
|---|---|
| array | Required. Specifies an array |
| start | Required. Numeric value. Specifies where the function will start the slice.
0 = the first element.
If this value is set to a negative number, the function will start slicing that far from the last element.
-2 means start at the second last element of the array. |
| length | Optional. Numeric value. Specifies the length of the returned array.
If this value is set to a negative number, the function will stop slicing that far from the last element. If this value is not set, the function will return all elements, starting from the position set by the start-parameter.
|
| preserve | Optional. Specifies if the function should preserve or reset the keys. Possible values:
|
Tegniese besonderhede
| Terugkeerwaarde: | Wys geselekteerde dele van 'n skikking |
|---|---|
| PHP weergawe: | 4+ |
| PHP Changelog: | Die preserveerparameter is bygevoeg in PHP 5.0.2 |
Meer voorbeelde
Voorbeeld 1
Begin die sny vanaf die tweede skikkingselement en gee slegs twee elemente terug:
<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,1,2));
?>
Voorbeeld 2
Gebruik 'n negatiewe beginparameter:
<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,-2,1));
?>
Voorbeeld 3
Met die preserveerparameter op waar gestel:
<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,1,2,true));
?>
Voorbeeld 4
Met beide string- en heelgetalsleutels:
<?php
$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow","e"=>"brown");
print_r(array_slice($a,1,2));
$a=array("0"=>"red","1"=>"green","2"=>"blue","3"=>"yellow","4"=>"brown");
print_r(array_slice($a,1,2));
?>
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