逐行替换字符串变量在其他变量中包含此字符串

Question

I have variable that contains very long list, each line of this list is unique, example:

$list = "http://example.com/xcvdre4a/our_trip-2014.jpg
http://example.com/awe38fd/weeding.jpg
http://example.com/ds543gfd/church.jpg"

I have foreach script where I would like to replace word from $variable into full link from the list above:

$variable = "church.jpg";
// use the word from $variable to find a link from $list and replace $variable.
echo $variable;
// should be "http://example.com/notsorted/church.jpg"

How can I do it?

I thought to change $list into an array and compare each array value to $variable, but it's not very good solution when I have many variables to replace.

Answer 1

You'll have to explode your list on new lines (PHP_EOL) to get an array of URL, then check if the variable is a sub-string of any URL (with strpos) :

foreach (explode(PHP_EOL, $list) as $url) {
 if (strpos($url, $variable) !== false) {
  $variable = $url;
  break;
 }
}

echo $variable;

Output :

http://example.com/ds543gfd/church.jpg

This code will return the first URL that match the variable. Remove the break if you want the last one instead, or use an array to store any corresponding URL you find.