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PHP 有一些用来排序数组的函数, 这个文档会把它们列出来。
主要区别有:
函数名称 | 排序依据 | 数组索引键保持 | 排序的顺序 | 相关函数 |
---|---|---|---|---|
array_multisort() | 值 | 键值关联的保持,数字类型的不保持 | 第一个数组或者由选项指定 | array_walk() |
asort() | 值 | 是 | 由低到高 | arsort() |
arsort() | 值 | 是 | 由高到低 | asort() |
krsort() | 键 | 是 | 由高到低 | ksort() |
ksort() | 键 | 是 | 由低到高 | asort() |
natcasesort() | 值 | 是 | 自然排序,大小写不敏感 | natsort() |
natsort() | 值 | 是 | 自然排序 | natcasesort() |
rsort() | 值 | 否 | 由高到低 | sort() |
shuffle() | 值 | 否 | 随机 | array_rand() |
sort() | 值 | 否 | 由高到低 | rsort() |
uasort() | 值 | 是 | 由用户定义 | uksort() |
uksort() | 键 | 是 | 由用户定义 | uasort() |
usort() | 值 | 否 | 由用户定义 | uasort() |
[#1] monicse09ku at yahoo dot com [2015-06-25 06:57:47]
// takes an array and desired key value and returns an array
// searches through an array for a given key, if found the key that row is made the first row and the other rows are inserted accordingly.
// the facility of this function is to get the value with a specific key of an array as the first value.
/////////////////////////////// function starts //////////////////////////////
function dksort($array, $case){
if(array_key_exists($case,$array)){
$a[$case] = $array[$case];
foreach($array as $key=>$val){
if($case==$key){
}else{
$a[$key] = $array[$key];
}
}
}
return $a;
}
$d = array(
'22'=>'jdfhgjfd',
'33'=>'jdfhgjfd',
'11'=>'jrtyrjfd',
'55'=>'jrtydairjfd',
'77'=>'jopo',
'99'=>'jrtasajfd',
'44'=>'jopasdwo',
'88'=>'hdgatyuyuiuy'
);
$c = dksort($d, '55');
print_r($c);
////////////////////////// function ends ////////////////////////////////////////
[#2] Mssler [2015-06-23 09:56:06]
simple example sorting dotted version numbers
function sortByVersionnumber($a,$b){
$ta=explode(".",$a); $tb=explode(".",$b);
foreach ($ta as $k => $v){
if (isset($tb[$k])){
if($ta[$k] > $tb[$k]) {
return 1;
} elseif($ta[$k] < $tb[$k]) {
return -1;
}
}
}
return 0;
}
function vnksort(&$array){
uksort($array ,"sortByVersionnumber");
}
[#3] felipe at planow dot com dot br [2014-02-03 11:04:35]
hello guys, I'm needing to show neighborhoods alphabetically in cakephp, the list is being displayed in a "option"
echo $this->Form->input('bairro', array('label' => 'Bairro', 'empty' => 'Selecione a cidade', 'options' => array()));
the code this up ... can someone help me?
[#4] "Matthew Rice" [2013-05-17 20:28:34]
While this may seem obvious, user-defined array sorting functions ( uksort(), uasort(), usort() ) will *not* be called if the array does not have *at least two values in it*.
The following code:
<?php
function usortTest($a, $b) {
var_dump($a);
var_dump($b);
return -1;
}
$test = array('val1');
usort($test, "usortTest");
$test2 = array('val2', 'val3');
usort($test2, "usortTest");
?>
Will output:
string(4) "val3"
string(4) "val2"
The first array doesn't get sent to the function.
Please, under no circumstance, place any logic that modifies values, or applies non-sorting business logic in these functions as they will not always be executed.
[#5] oculiz at gmail dot com [2011-03-12 09:57:30]
Another way to do a case case-insensitive sort by key would simply be:
<?php
uksort($array, 'strcasecmp');
?>
Since strcasecmp is already predefined in php it saves you the trouble to actually write the comparison function yourself.
[#6] Dirk [2010-03-29 13:32:56]
If you need to perform any of these sort functions on an array containing two or more equivalent values, you can get the equivalents to fall next to each other within the overall ordering (similar to how MySQL's ORDER BY works...) instead of breaking the sort() function, by using ksort() as a second parameter to arbitrarily distinguish any equivalent values by their unique keys:
<?php
sort($array, ksort($array));
?>
Seems like this effect should be built in. At least the workaround is so short...