PHP截断字符串

Question

逗号PHP，我想改变这个字符串：

",,,3,4,,,5,6,,7,8,"

到这一点：

"3,4,5,6,7,8"

我已经成功地剥离之初逗号和字符串的末尾，但这只能完成我需要的50％：

<?php 
$hello = ",,,3,4,5,6,,7,8,"; 
echo rtrim(ltrim($hello,","),","); 

结果：

"3,4,,,5,6,,7,8"

任何解决方案？

Answer 1

您可以使用TRIM（），并至REGx实现这一点，请对下面的代码一看，它可以帮助你

$from = ",,,,,,3,4,,,5,6,,7,8,,,"; 
echo $from; 
echo "<pre>"; 
$to = preg_replace('/,+/', ',', trim($from,",")); 
echo $to; 

Answer 2

做这个小动作：

$hello = ",,,3,4,,,5,6,,7,8,"; 
$hello = implode(",",array_filter(explode(',',$hello))); 

如果字符串是更复杂（也就是说，它是一个CSV这可能潜在有田裹“”逃避逗号，你可以这样做：

$hello = ",,,3,4,,,5,6,,\"I,have,commas\",,7,8,"; 
$fields = array_filter(str_getcsv($hello)); 
$hello = str_putcsv($fields); 

凡str_putcsv在https://gist.github.com/johanmeiring/2894568定义为

if (!function_exists('str_putcsv')) { 
    function str_putcsv($input, $delimiter = ',', $enclosure = '"') { 
     $fp = fopen('php://temp', 'r+b'); 
     fputcsv($fp, $input, $delimiter, $enclosure); 
     rewind($fp); 
     $data = rtrim(stream_get_contents($fp), "\n"); 
     fclose($fp); 
     return $data; 
    } 
} 

Answer 3

implode(",", array_filter(explode(",", ",,,3,4,,,5,6,,7,8,"))

这是一点点阅读，但基本上explode在逗号上的字符串，请拨打array_filter上的结果，然后implode它回来。