Help to see what this code means? I haven't read it for 1 hours, thanks.

Help to see what this code means? I haven't read it for 1 hours.
$patt = Array (' __public__ ', ' __action__ ', ' __control__ ', ' __web__ ', ' __app__ ');
$replace = Array (' ', ' ', ' ', ' ', ' ');
$content = Str_ireplace ('.. /public ', ' ', $content);
$content = Str_replace ($patt, $replace, $content);

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------Solution--------------------
String Substitution!
Put the $content in the
__public__ replaced
__action__ replaced
__control__ replaced
__web__ replaced
__app__ replaced
.. /public replaced

------Solution--------------------
This is not understand, should go back to the remedial foundation
------Solution--------------------
$replace = Array (' ', ' ', ' ', ' ', ' ');

I've never written this before.
------Solution--------------------
Reference:

$replace = Array (', ', ', ', ', ' );

I've never written this before.

$replace = Array (' ', ' ', '

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