What modifiers should be set to ensure proper functionality in the preg_replace function?

When using the preg_replace function in PHP, it is important to set the appropriate modifiers to ensure proper functionality. The "i" modifier should be used for case-insensitive matching, the "m" modifier for multiline matching, and the "s" modifier for treating the input as a single line. These modifiers help to make sure that the regular expression pattern matches the desired text in the input string. 

// Example of using preg_replace with appropriate modifiers
$input = "Hello World";
$pattern = "/hello/i";
$replacement = "Hi";
$output = preg_replace($pattern, $replacement, $input);
echo $output;

Keywords

PHP preg_replace modifiers functionality regular expressions

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