Question

How can I prepend a string, say 'a' stored in the variable $x to each line of a multi-line string variable using PHP?

Answer 1

Because of your each line requirement, I would first split the string to an array using explode, then loop through the array and add text to the beginning of each line, and then turn the array back to a string using implode. As long as the number of lines is not very big, this can be a suitable solution.

Code sample:

$arr = explode("\n", $x);
foreach ($arr as $key => $value) {
    $arr[$key] = 'a' . $arr[$key];
}
$x = implode("\n", $arr);

Example at: http://codepad.org/0WpJ41LE