(PHP 4, PHP 5, PHP 7, PHP 8)
array_count_values — 统计数组中每个不同值的出现次数
array统计这个数组的值
返回一个关联数组，用 array
数组中的值作为键名，该值在数组中出现的次数作为值。
示例 #1 array_count_values() 例子
<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>以上示例会输出：
Array
(
[1] => 2
[hello] => 2
[world] => 1
)
Simple way to find number of items with specific values in multidimensional array:<?php$list = [ ['id' => 1, 'userId' => 5], ['id' => 2, 'userId' => 5], ['id' => 3, 'userId' => 6],];$userId = 5;echo array_count_values(array_column($list, 'userId'))[$userId]; // outputs: 2?>I couldn't find a function for counting the values with case-insensitive matching, so I wrote a quick and dirty solution myself:<pre><?phpfunction array_icount_values($array) { $ret_array = array(); foreach($array as $value) { foreach($ret_array as $key2 => $value2) { if(strtolower($key2) == strtolower($value)) { $ret_array[$key2]++; continue 2; } } $ret_array[$value] = 1; } return $ret_array;}$ar = array('J. Karjalainen', 'J. Karjalainen', 60, '60', 'J. Karjalainen', 'j. karjalainen', 'Fastway', 'FASTWAY', 'Fastway', 'fastway', 'YUP');$ar2 = array_count_values($ar); // Normal matching$ar = array_icount_values($ar); // Case-insensitive matchingprint_r($ar2);print_r($ar);?></pre>This prints:Array( [J. Karjalainen] => 3 [60] => 2 [j. karjalainen] => 1 [Fastway] => 2 [FASTWAY] => 1 [fastway] => 1 [YUP] => 1)Array( [J. Karjalainen] => 4 [60] => 2 [Fastway] => 4 [YUP] => 1)I don't know how efficient it is, but it seems to work. Needed this function in one of my scripts and thought I would share it.Here is a Version with one or more arrays, which have similar values in it:
Use $lower=true/false to ignore/set case Sensitiv.
<?php
$ar1[] = array("red","green","yellow","blue");
$ar1[] = array("green","yellow","brown","red","white","yellow");
$ar1[] = array("red","green","brown","blue","black","yellow");
#$ar1= array("red","green","brown","blue","black","red","green"); // Possible with one or multiple Array
$res = array_icount_values ($ar1);
print_r($res);
function array_icount_values($arr,$lower=true) {
$arr2=array();
if(!is_array($arr['0'])){$arr=array($arr);}
foreach($arr as $k=> $v){
foreach($v as $v2){
if($lower==true) {$v2=strtolower($v2);}
if(!isset($arr2[$v2])){
$arr2[$v2]=1;
}else{
$arr2[$v2]++;
}
}
}
return $arr2;
}
/*
Will print:
Array
(
[red] => 3
[green] => 3
[yellow] => 4
[blue] => 2
[brown] => 2
[white] => 1
[black] => 1
)
*/
?>