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One thing I would do is that str_replace can receive an array of items to look for and an array of its replacement:

PHP str_replace

// Provides: You should eat pizza, beer, and ice cream every day
$phrase = "You should eat fruits, vegetables, and fiber every day.";
$healthy = array("fruits", "vegetables", "fiber");
$yummy = array("pizza", "beer", "ice cream");
$newphrase = str_replace($healthy, $yummy, $phrase);

instead of going line by line to do it.

Just nit-picking but

sizeof() is an alias of count() and count() is more widely used, so use something that is more general in the PHP community

Also $_POST != null would typically be !isset($_POST) rather as explained in this post

One thing I would do is that str_replace can receive an array of items to look for and an array of its replacement:

PHP str_replace

// Provides: You should eat pizza, beer, and ice cream every day
$phrase = "You should eat fruits, vegetables, and fiber every day.";
$healthy = array("fruits", "vegetables", "fiber");
$yummy = array("pizza", "beer", "ice cream");
$newphrase = str_replace($healthy, $yummy, $phrase);

instead of going line by line to do it.

Just nit-picking but

sizeof() is an alias of count() and count() is more widely used, so use something that is more general in the PHP community

Also $_POST != null would typically be !isset($_POST) rather as explained in this post

One thing I would do is that str_replace can receive an array of items to look for and an array of its replacement:

PHP str_replace

// Provides: You should eat pizza, beer, and ice cream every day
$phrase = "You should eat fruits, vegetables, and fiber every day.";
$healthy = array("fruits", "vegetables", "fiber");
$yummy = array("pizza", "beer", "ice cream");
$newphrase = str_replace($healthy, $yummy, $phrase);

instead of going line by line to do it.

Just nit-picking but

sizeof() is an alias of count() and count() is more widely used, so use something that is more general in the PHP community

One thing I would do is that str_replace can receive an array of items to look for and an array of its replacement:

PHP str_replace

// Provides: You should eat pizza, beer, and ice cream every day
$phrase = "You should eat fruits, vegetables, and fiber every day.";
$healthy = array("fruits", "vegetables", "fiber");
$yummy = array("pizza", "beer", "ice cream");
$newphrase = str_replace($healthy, $yummy, $phrase);

instead of going line by line to do it.

Just nit-picking but

sizeof() is an alias of count() and count() is more widely used, so use something that is more general in the PHP community

Also $_POST != null would typically be !isset($_POST) rather as explained in this post