Text Processing

PHP String Function: Text Processing
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sprintf()

sprintf(string $format, mixed ...$values): string

Returns a string produced according to the formatting string format.

vsprintf()

vsprintf(string $format, array $values): string

Operates as sprintf() but accepts an array of arguments, rather than a variable number of arguments.

vsprintf("%04d-%02d-%02d", explode('-', '1988-8-1'));

Minify html output

function sanitize_output($buffer) {

    $search = array(
        '/\>[^\S ]+/s',     // strip whitespaces after tags, except space
        '/[^\S ]+\</s',     // strip whitespaces before tags, except space
        '/(\s)+/s',         // shorten multiple whitespace sequences
        '/<!--(.|\s)*?-->/' // Remove HTML comments
    );

    $replace = array(
        '>',
        '<',
        '\\1',
        ''
    );

    $buffer = preg_replace($search, $replace, $buffer);

    return $buffer;
}

ob_start("sanitize_output");

Reference