如何擺脫空白？

Question

$data = "google,bing,searchengine,seo,search"; 

$exp = explode(",",$data); 

$filtr = array("google","bing"); 

$fdat = str_replace($filtr,"",$data); 

$clean = implode(",",$fdat); 

echo $clean; 

這給了放,,searchengine,seo,search

如何才能擺脫前兩個空白的逗號？

Answer 1

更好地得到您的分裂陣列$exp減去$filtr的區別：

$clean = implode(',', array_diff($exp, $filtr)); 

這也將避免你將只刪除一個字的子從bike,car,carpet刪除car時一樣的機會應導致bike,carpet和不在bike,pet。

如果你想允許空格前後各單詞後，可以考慮使用trim和preg_split：

$exp = preg_split('/\s*,\s*/', trim($data)); 

trim將刪除任何先前和結尾的空白，併爲preg_split該模式允許周圍逗號太多的空白。

Answer 2

嘗試此代碼時出現錯誤。您可以使用以下方法來從一個逗號分隔的字符串中刪除谷歌&兵（即在陣列中）：

$data = "google,bing,searchengine,seo,search";
$exp = explode(",",$data);
$filtr = array("google","bing");
$diff = array_diff($exp, $filtr);
$clean = implode(",",$diff);
echo $clean;

Answer 3

你的代碼也可能是這樣的：

$data = "google,bing,searchengine,seo,search"; 

$exp = explode(",",$data); 

$filtr = array("google","bing"); 

foreach ($exp as $key => $item) { 
    if (in_array($key, $filtr)) unset($exp[$key]); 
} 

$clean = implode(",",$exp); 

echo $clean; 

其當$ data中的項目很少時很有用。對於大數組，它需要優化。

Answer 4

如果一個循環內檢查的價值，像這樣你會更好：

$data = "google,bing,searchengine,seo,search"; 
$exp = explode(",",$data); 
$filtr = array("google","bing"); 

foreach($exp as $k => $v) 
{ 
    if(in_array($v,$filtr)) 
    { 
     unset($ext[$k]); 
    } 
} 
$clean = implode(",",$ext); 
echo $clean;