Cut the string in string using PHP

March 3, 2022

There can be strings as follow,

p=aa&u=dd&p=ff
u=dd&p=ff
p=aa&u=dd
u=dd
p=aa&u=dd&p=ff&f=kk

I need to get u= value which is dd for now but u= value can be changed. It is always u= value.

I have trid following code for that,

strstr("p=aa&u=dd&p=ff&f=kk","u=");

if (($tmp = strstr($str, 'u=')) !== false) {
    $str = substr($tmp, 2);
}

echo substr($str, 0, strpos($str, '&'));

This give dd value but when string is u=dd or p=aa&u=dd, not give any value. Which are u= part is end.

>Solution :

if you want to get what is after = you can try somehting like this :

Example #1 Using parse_str()

<?php
$str = "first=value&arr[]=foo+bar&arr[]=baz";
// Recommended
parse_str($str, $output);
echo $output['first'];  // value
echo $output['arr'][0]; // foo bar
echo $output['arr'][1]; // baz
// DISCOURAGED
parse_str($str);
echo $first;  // value
echo $arr[0]; // foo bar
echo $arr[1]; // baz
?>

Example #2 parse_str() name mangling

<?php
parse_str("My Value=Something");
echo $My_Value; // Something

parse_str("My Value=Something", $output);
echo $output['My_Value']; // Something
?>