Question

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How to replace text over multiple lines using preg_replace

I am trying to read some text from a file and than replacing some pattern. If I try to replace the patern from just a single string it works, but if there are multiple such strings in a file it doesnt work.

$this->session->set_flashdata(‘error_message’, ‘Naslovna vrstica je bila uspešno shranjena’);

This is an example of text that I am trying to replace the replacment works ok with just this line, but not if there are other such lines in a file, which all match individualy though.

$content = file_get_contents("C:\Users\Borut\\test.txt");
$pattern="/^.*session->set_flashdata\((.*),(.*)\);$/";
$replacement="\$_SESSION[$1]=$2";

this is my code. How do you replace multiple strings as the one shown above.

Answer 1

The modifier you want is m. You can find all modifiers here
That said, the easiest and better regex solution would be

"/\$this->session->set_flashdata\((.*?),\s*(.*?)\);/"

Notice how there’s a ? after the .* in each. This is to stop greedy matching as with yours. Also notice that the modifier isn’t required either with the removal of the ^ and $