如何在php中处理字符串

Question

I have string like this

$str="absdbsasd k=12312 sdasd l=89879 m=ken asddq casdasd"

and the output should be like this

the question is how to process the string on variable $str to get output which is like this

k=12312
l=89879
m=ken asddq casdasd

I have tried to implement parse_str after I replace the space character (' ') into '&', but the output still got the wrong answer

k=12312
l=89879
m=ken

Could anybody help me..

Answer 1

Assuming the logic is that identifiers are word chars ending with a = and values ends when the next identifier comes, but if the value starts with numbers then only the first word of numbers needed for the value, i would go about it like this:

$str="absdbsasd k=12312 sdasd l=89879 m=ken asddq casdasd";

$parts = preg_split('/(\w+=)/', $str, -1, PREG_SPLIT_DELIM_CAPTURE);

$result = array();
$prev_was_an_identifier = false;
$last_identifier = null;
foreach ($parts as $part) {
    if ($prev_was_an_identifier) {
        if (preg_match('/^\d+/', $part)) {
            $result[$last_identifier] = preg_replace('/^(\d+).*/', '$1', $part);
        } else {
            $result[$last_identifier] = $part;
        }   
        $prev_was_an_identifier = false;
    } elseif (preg_match('/=$/', $part)) {
        $prev_was_an_identifier = true;
        $last_identifier = mb_substr($part, 0, -1);
    }
}

outputs:

array (
  'k' => '12312',
  'l' => '89879',
  'm' => 'ken asddq casdasd',
)

Answer 2

Well, first you need to define the structure of the string something like this:

$str = "$first_value k=$secound_value l=$third_value m=$forth_value";

If the structure is as I have written, then It's pretty impossible to get what you need, since there are no sepperators or any other types of way to determine where one value ends and another value begins. Look at this example:

$str="absdbsasd k=12312 sdasd l=s l=8987 l=s 9 m=ken asddq casdasd"

There is no way to teel where the real l= starts.

If you would add some seperators like ' ( and make sure they don't appear in the values, the you can get something like this:

$str="'absdbsasd' k='12312 sdasd l=s' l='8987 l=s 9' m='ken asddq casdasd'"

And then you can do a preg_match or preg_split check and get your desired values.

Or, suggested, just make an array in the 1st place.