PHP在数组中的特定字符串后获取字符串

Question

I have a string something like aa/bb/cc/dd/55/44. Now I converted it into array using explode function.

explode("/","aa/bb/cc/dd/55/44");

Here, I want to always get the string after dd. String is dynamic i.e. dd can come in any position, but immediately after dd i want to get the string i.e. 55. How can I achieve it using PHP ?

Answer 1

However, for the record, if you wanted to safely catch all the occurrences of your pattern (not only just the last match), anything in between the dd/ and the next first /, then you may use the following:

$re = "~(?<=dd/).*?(?=/)~"; 
$str = "aa/bb/cc/dd/55/44/dd/66/"; 

preg_match_all($re, $str, $matches);
print_r($matches[0]);
// output: Array ( [0] => 55 [1] => 66 )