在PHP中删除字符串左右两侧的字符

Question

This is an example of a string: abcde123#ijklmn0pq

In that string I need to print out only the numbers (the 123 sequence), and remove the letters (from both left and right) and the hashtag (#) to be removed as well.

The hashtag (#) is always included in the string.

The hashtag (#) is always positioned to the right of the characters that need to be printed;

The hashtag (#) is always positioned to the left of the characters that need to be removed;

Therefore, the hashtag (#) can be used as a guide to remove the letters from the Right

The number of characters in the beginning is always equal to 5 (constant) (to be removed);

The number of characters in the middle is always different (variable) (to be printed);

The number of characters in the right is always different (variable) (to be removed);

Here's another string example, similar to the first one: !!@@$IMPORTANT#=-=whatever

The characters that need to be printed are the word "IMPORTANT"

As with the first example, what's on the left side of the hashtag (#) needs to be printed, but it's important to print only the "IMPORTANT" word, without the special characters "!!@@$".

Answer 1

$myString = '!!@@$IMPORTANT#=-=whatever';

$result = substr($myString, 5, -1);

$pos = strpos($result, '#');

$result = substr($result, 0, $pos);

echo $result;