PHP - str_replace() all variations

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// Regular, replaces all occurrences.
// str_replace(array|string $find_string, array|string $replace_with, string|array $subject, int &$count = null): string|array
$string = str_replace('and', '&', 'search and replace');
print $string; // Output: search & replace
 
// Input is array, replaces all occurrences.
$char_list = array('!', '@');
$string = str_replace($char_list, '', 'res@!ult');
print $string; // Output: result
 
// Input and replacement are arrays, replaces with corresponding values.
$subject = 'ABABABAB';
$search = array('B', 'A');
$replace  = array('A', 'B');
$string = str_replace($search, $replace, $subject);
print $string; // Output: BBBBBBBB
// The values are replaced in a loop. So it won't be BABABABA, as you might expect intuitively.
 
// Count the replacements.
$count = 0;
$str = str_replace('A', '', 'ABC', $count);
print $count; // Output: 1
 
// ireplace means you can use the function in case-insensitive mode.
$string = str_ireplace('AND', '&', 'search and replace');
print $string; // Output: search & replace
 
// Using regular expression. Parentheses are used to determinate sub-patterns. Subpattern results are put to variables such as $1, $2, etc.
// preg_replace(string|array $pattern, string|array $replacement, string|array $subject, int $limit = -1, int &$count = null): string|array|null
echo preg_replace('/<picture(.*?)href=/', '<img$1src=', $subject);
Programming Language: PHP