計數特定陣列值開始的東西

我有此數組：計數特定陣列值開始的東西

$array = array("pg_1","pg_2","pg_3","pg_4","pg_5","qr_1","qr_2","qr_3");

我想指望這是價值觀開始與皮克。

到目前爲止，我已經嘗試下面的代碼：

$arraycount = array_count_values($array); 

$countpg = $arraycount['pg%'];

我忘了，我有鍵和值：

$array = Array ([pg_1] => 2 [pg_2] => 3 [pg_3] => 2 [pg_4] => 4 [pg_5] => 1 [gp_1] => 1 [gp_2] => 4 [gp_3] => 3)

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2016-11-21 Sergio Teixeira

如果值包含pg，然後增加$i

$array = array("pg_1","pg_2","pg_3","pg_4","pg_5","qr_1","qr_2","qr_3"); 
$i = 0; 

foreach ($array as $value) { 
    if (strpos($value, 'pg') !== false) { 
     $i++; 
    } 
} 
echo $i;

只注意到你的編輯...

對於關聯數組，只是改變Foreach環看$key和$value和如最後一個示例所示，查詢$key而不是$value。

$array = ["pg_1" => 2, "pg_2" => 3, "pg_3" => 2, "pg_4" => 4, "pg_5" => 1, "gp_1" => 1, "gp_2" => 4, "gp_3" => 3]; 
$i = 0; 

foreach ($array as $key => $value) { 
    if (strpos($key, 'pg') !== false) { 
     $i++; 
    } 
} 
echo $i;

來源

2016-11-21 12:30:39 Kitson88

$array = array("pg_1","pg_2","pg_3","pg_4","pg_5","qr_1","qr_2","qr_3"); 

$count = count(array_filter($array, function($item) { 
    return strpos($item, 'pg') === 0; 
})); 

echo $count;

你過濾與 'PG' 啓動項目然後計算結果。

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2016-11-21 12:26:23 user2693928

使用以下方法： -

$陣列=陣列（「pg_1」，「pg_2」，「pg_3」，「pg_4」，「pg_5」，「qr_1」，「qr_2」「qr_3」）;

$search_val = preg_quote('pg', '*'); 

$result = preg_grep('*' . $search_val . '*', $array); 

count($result);

來源

2016-11-21 12:30:28

一條線的解決方案是使用preg_grep功能

嘗試以下代碼：

$array = array("pg_1","pg_2","pg_3","pg_4","pg_5","qr_1","qr_2","qr_3"); 
$count = count(preg_grep('/pg/',$array)); 
echo $count;

有關的函數的更多的參考指該鏈接 - http://php.net/manual/en/function.preg-grep.php

來源

2016-11-21 12:32:38

我會使用陣列濾波器這裏：

$array = array("pg_1","pg_2","pg_3","pg_4","pg_5","qr_1","qr_2","qr_3"); 

$c = count(array_filter($array, "getPG")); 

function getPG($key) 
{ 
    return strpos($key, "pg_") === 0; 
} 

echo 'count: ' .$c;

您將擁有以$c存儲的以「pg_」開頭的數組元素的正確計數。

來源

2016-11-21 12:32:57 Stuart

計數特定陣列值開始的東西

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