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phpstringexplodeseparator

Get first string before separator?

I have strings with folowing structure: 

7_string_12
7_string2_122
7_string3_1223

How I can get string before second "_" ?

I want my final result to be :

7_string
7_string2
7_string3

I am using explode('_', $string) and combine first two values, but my script was very slow!

Solution 
  • $str = '7_string_12';
echo substr($str,0,strrpos($str,'_'));

    echoes

    7_string

    no matter what's at the begining of the string