how to add php mode hooks in emacs

Question

I have a emacs mode hook code

(defun php-mode-hook ()
  (setq tab-width 4
        c-basic-offset 4
        c-hanging-comment-ender-p nil
        indent-tabs-mode
          (not
            (and (string-match "/\\(PEAR\\|pear\\)/" (buffer-file-name))
              (string-match "\.php$" (buffer-file-name))))))

I need to ensure to call this function whenever i open a php file within emacs.. i have installed php-mode for emacs as well as added this code in .emacs file but it seems not to be working.. can anyone tell me how to add such customization code for emacs?

NOTE: I have recently migrated to emacs.. please be more descriptive while answering.. :)

Updated code1

(add-hook 'php-mode-hook
   '(lambda()
     (setq tab-width 4
      c-basic-offset 4
      c-hanging-comment-ender-p nil
      indent-tabs-mode
      (not
       (and (string-match "/\\(PEAR\\|pear\\)/" (buffer-file-name))
            (string-match "\.php$" (buffer-file-name)))))))

Answer 1

Adding hooks to places provided by various modes usually works using the add-hook function. You defined a function with the name of the hook you wanted to use. Instead, you should define a function with another name, add add-hook that to the php-mode-hook:

(defun my-php-settings ()
  ...)

(add-hook 'php-mode-hook 'my-php-settings)

In fact, you don't even need to create a named function at all:

(add-hook 'php-mode-hook
          (lambda ()
            (setq tab-width 4 ...)))