Question

I have a comma delimited string and want the first 100 entries (not including the 100th comma) as a single string.

例如,如果我有扼杀性的话。

a,b,c,d,e,f,g

问题在于头3个条目,预期结果将加以说明。

a,b,c

Answer 1

利用探索/简化:

$str     =  a,b,c,d,e,f,g ;
$temp1   = explode( , ,$str);
$temp2   = array_slice($temp1, 0, 3);
$new_str = implode( , , $temp2);

采用:

$new_str = preg_replace( /^((?:[^,]+,){2}[^,]+).*$/ , 1 ,$str);

Answer 2

网址:explode()功能。

$string_array = explode(",",$string);

• 通过阵列获取你想要的价值观:

for($i = 0; $i < sizeof($string_array); $i++)
{
echo $string_array[$i];//display values
}

Answer 3

您可以找到第100条定义:

$delimiter =  , ;
$count = 100;
$offset = 0;
while((FALSE !== ($r = strpos($subject, $delimiter, $offset))) && $count--)
{
    $offset = $r + !!$count;
}
echo substr($subject, 0, $offset), "
";

或以类似方式表示:

$delimiter =  , ;
$count = 100;
$len = 0;
$tok = strtok($subject, $delimiter);
while($tok !== FALSE && $count--)
{
    $len += strlen($tok) + !!$count;
    $tok = strtok($delimiter);
}
echo substr($subject, 0, $len), "
";

Answer 4

One way is to split the string after a comma and put the first 100 indexes together (comma-separated). Before this you have to check if count(array) is greater or smaller than 100.

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