カウント出現

Question

誰もがこの配列に「写真」の発生をカウントする方法を知っています：

Array ( 
    [0] => stdClass Object ([type] => photo [id] => 1404781893036 [created_time] => 2012-03-02T07:58:23+0000) 
    [1] => stdClass Object ([type] => photo [id] => 14047818930362 [created_time] => 2012-03-01T14:58:53+0000) 
    [2] => stdClass Object ([type] => status [id] => 1404781893036 [created_time] => 2012-03-01T09:49:40+0000) 
    [3] => stdClass Object ([type] => status [id] => 14047818930362 [created_time] => 2012-03-01T09:36:04+0000) 
    [4] => stdClass Object ([type] => photo [id] => 14047818930362 [created_time] => 2012-02-28T07:03:25+0000) 
    [5] => stdClass Object ([type] => photo [id] => 1404781893036 [created_time] => 2012-02-27T09:15:34+0000) 
    [6] => stdClass Object ([type] => photo [id] => 14047818930362 [created_time] => 2012-02-27T07:32:13+0000) 
    [7] => stdClass Object ([type] => status [id] => 1404781893036 [created_time] => 2012-02-25T09:36:57+0000) 
    [8] => stdClass Object ([type] => photo [id] => 1404781893036 [created_time] => 2012-02-23T08:46:43+0000) 
    [9] => stdClass Object ([type] => status [id] => 1404781893036 [created_time] => 2012-02-22T21:04:30+0000) 
    [10] => stdClass Object ([type] => status [id] => 1404781893036 [created_time] => 2012-02-21T20:38:27+0000) 
    [11] => stdClass Object ([type] => photo [id] => 1404781893036 [created_time] => 2012-02-21T07:22:44+0000) 
    [12] => stdClass Object ([type] => status [id] => 14047818930362 [created_time] => 2012-02-20T08:32:46+0000) 
    [13] => stdClass Object ([type] => status [id] => 1404781893036 [created_time] => 2012-02-17T15:00:11+0000)) 

Answer 1

$count = 0; 
foreach ($array as $item) { 
    if ($item->type === 'photo') { 
    $count++; 
    } 
} 

Answer 2

をしてみてください

$input = array(/* your data */); 
$count = 0; 
foreach ($input as $value) { 
    if ($value->type == 'photo') { 
    $count++; 
    } 
} 

Answer 3

多次元配列内の文字列の一致の出現をカウントするには、各配列要素を繰り返し処理し、文字列を一致させてカウントを増やす必要があります。同様に@Dorが提案しました

$count = 0; 
foreach ($array as $item) { 
    if ($item->type === 'photo') { 
    $count++; 
    } 
} 

もしあなたが一次元配列で同じことを達成したいなら、それはかなり簡単です。以下に説明するようにarray_count_values PHP配列関数を使用することができます。

<?php 
    $array = array(1, "test", 1, "php", "test"); 
    print_r(array_count_values($array)); 
?> 

上の例の出力は以下となります。

Array 
(
    [1] => 2 
    [test] => 2 
    [php] => 1 
) 

Answer 4

私はドールShemerによって方法は（IMO）ほとんど、直接クリーン、読みやすい、かつ信頼性の高い方法であることを認識したいと思います。私はちょうど機能的なプログラミングを使用することを好む人のためのいくつかの選択肢を提供したい... array_reduce()私のために近い秒です。最後に、私はarray_count_values()を使用する方法のための小さな落とし穴を特定したい - メソッドの上お読みください...

バッテリー：（Demo）

$photo_count=0; // establish default value 
foreach($array as $objects){ 
    if($objects->type==='photo') ++$photo_count; // pre-increment 
} 
echo "foreach result = $photo_count"; 

echo "array_reduce = ",array_reduce($array,function($carry,$objects){return $carry+($objects->type==='photo'?1:0);},0); 

echo "array_filter & count = ",sizeof(array_filter($array,function($objects){return $objects->type==='photo';})); 

echo "array_column & array_filter & count = ",sizeof(array_filter(array_column($array,'type'),function($v){return $v==='photo';})); 

echo "array_map & array_count_values & array_replace = ",array_replace(['photo'=>0],array_count_values(array_map(function($o) {return $o->type;}, $array)))['photo']; 

echo "array_map & array_count_values (gives Notice) = ",array_count_values(array_map(function($o) {return $o->type;}, $array))['photo']; 

OPのサンプルデータを使用して、入力/出力（ノートラブル）：なしphoto値を

$array=[ 
    (object)['type'=>'photo','id'=>1404781893036,'created_time'=>'2012-03-02T07:58:23+0000'], 
    (object)['type'=>'photo','id'=>14047818930362,'created_time'=>'2012-03-01T14:58:53+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-03-01T09:49:40+0000'], 
    (object)['type'=>'status','id'=>14047818930362,'created_time'=>'2012-03-01T09:36:04+0000'], 
    (object)['type'=>'photo','id'=>14047818930362,'created_time'=>'2012-02-28T07:03:25+0000'], 
    (object)['type'=>'photo','id'=>1404781893036,'created_time'=>'2012-02-27T09:15:34+0000'], 
    (object)['type'=>'photo','id'=>14047818930362,'created_time'=>'2012-02-27T07:32:13+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-02-25T09:36:57+0000'], 
    (object)['type'=>'photo','id'=>1404781893036,'created_time'=>'2012-02-23T08:46:43+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-02-22T21:04:30+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-02-21T20:38:27+0000'], 
    (object)['type'=>'photo','id'=>1404781893036,'created_time'=>'2012-02-21T07:22:44+0000'], 
    (object)['type'=>'status','id'=>14047818930362,'created_time'=>'2012-02-20T08:32:46+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-02-17T15:00:11+0000'] 
]; 

// output: 
foreach result = 7 

array_reduce = 7 

array_filter & count = 7 

array_column & array_filter & count = 7 

array_map & array_count_values & array_replace = 7 

array_map & array_count_values = 7 

入力/出力使用して、データ（第2 array_count_values()方法で問題）：

$array=[ 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-03-01T09:49:40+0000'], 
    (object)['type'=>'status','id'=>14047818930362,'created_time'=>'2012-03-01T09:36:04+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-02-25T09:36:57+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-02-22T21:04:30+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-02-21T20:38:27+0000'], 
    (object)['type'=>'status','id'=>14047818930362,'created_time'=>'2012-02-20T08:32:46+0000'], 
    (object)['type'=>'status','id'=>1404781893036,'created_time'=>'2012-02-17T15:00:11+0000'] 
]; 
// or if there are no object rows like: $array=[]; 
// output: 
foreach result = 0 

array_reduce = 0 

array_filter & count = 0 

array_column & array_filter & count = 0 

array_map & array_count_values & array_replace = 0 

array_map & array_count_values (gives Notice) = <br /> 
<b>Notice</b>: Undefined index: photo in <b>[...][...]</b> on line <b>43</b><br /> 

array_count_values()は、0カウントの要素を生成することはありません。