如何连接函数输出？

Question

The task is obtain this:

Nel mezzo del cammin 
di nostra vita

from this:

  nel-MEZzo---del-cammin, <strong>BRAKELINE</strong>di nostra-vita. 

I'm really sick about this syntax:

function custom_function($v){
return str_replace("BRAKELINE","\n",$v);
}

$SRC = '  nel-MEZzo---del-cammin, <strong>BRAKELINE</strong>di nostra-vita. ';
$v = ucfirst(trim(strtolower(custom_function(preg_replace('/[^\w]+/',"\040",strip_tags($SRC))))));
echo $v;

and I tried something new:

function ifuncs($argv=NULL,$funcs=array()){
 foreach($funcs as $func){
    $argv = $func($argv);
 }
 return $argv;
}

$SRC = '  nel-MEZzo---del-cammin, <strong>BRAKELINE</strong>di nostra-vita. ';
$v = ifuncs(
$SRC,
array(
    'strip_tags',
    'f1' => function($v){ return preg_replace('/[^\w]+/',"\040",$v); },
    'f2' => function($v){
        return str_replace("BRAKELINE","\n",$v);
    },
    'strtolower',
    'trim',
    'ucfirst'
)

);
echo $v;

It's works very well, but I would to know if there is a better way (aka existing library) to do this.

Answer 1

What you have written is how array_reduce() works:

$fns = array(
    'strip_tags',
    function($v) {
        return preg_replace('/[^\w]+/', ' ', $v);
    },
    function($v) {
        return str_replace('BRAKELINE', "\n", $v);
    },
    'strtolower',
    'trim',
    'ucfirst',
);

$input = '  nel-MEZzo---del-cammin, <strong>BRAKELINE</strong>di nostra-vita. ';

$v = array_reduce($fns, function($result, $fn) {
  return $fn($result);
}, $input));

Applied to your current function:

function ifuncs(array $funcs, $input = null) 
{
    return array_reduce($funcs, function($result, $fn) {
        return $fn($result);
    }, $input));
}

Answer 2

No shorter, but quite more elegant.

function fns($input=NULL,$fns=array()){
   $input = array_reduce($fns, function($result, $fn) {
     return $fn($result);
   }, $input);
   return $input;
}