PHP - Not to execute specific code on specific page

Question

I have one common page: default.php

<?php 

  ________Some Codes________

?>

And my project has 100+ .php files. (Yes all files have require_once 'default.php'; on the first line of all pages)

Now, I am deciding to display alert in all the files except 2. (say 1.php & 2.php).

Of course, I'll add that alert in my default.php.

So now my default.php will look like:

<?php

________Some Codes_______


echo $comn_alert = "<script>alert('Hi');</script>";

?>

Question:

How can I stop $comn_alert from executing on 1.php & 2.php?

In this case, alert can go into a separate file and be included conditionally. Anyway, what does __FILE__ give you when you add this in default.php? — mighty_dev
– mighty_dev, Commented Jun 27, 2020 at 14:06
@vivek_23 "In this case, alert can go into a separate file and be included conditionally" so I need to add to 98 files individually? Also, "what does __FILE__ give you", I didn't get this. — Pal
– Pal, Commented Jun 27, 2020 at 14:18
PHP doc says for _FILE__: "If used inside an include, the name of the included file is returned.", so I'd guess it wouldn't work — Jb31
– Jb31, Commented Jun 27, 2020 at 14:18
@vivek_23 Do you mean including default in 1 & 2? If so, yes I can. — Pal
– Pal, Commented Jun 27, 2020 at 14:26

Jb31 · Accepted Answer · 2020-06-27 14:24:45Z

1

Several approaches:

You could use $_SERVER['PHP_SELF'] in default.php to check if it's included from either 1.php or 2.php
You could restructure your inclusion structure a little bit: Extract the common logic of default.php (i.e. the logic used in all files) into another file (e.g default_minimal.php) and make default.php require that file and contain the code in question (e.g. the alert()). Make then 1.php and 2.php only require default_minimal.php
Set a variable in 1.php and 2.php before requiring and then check in default.php for the existence / absence of this variable.

answered Jun 27, 2020 at 14:24

Jb31

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2 Comments

mighty_dev Over a year ago

Yes, I thought of the 3rd way where OP can define a constant before including the file and then check if that constant is defined in default.php.

Pal Over a year ago

Can you please expand your answer (small code) for point 1 & 3. And what are the merits and demerits of them? I'll not go with point 2 as in future if I need to change some codes in default, I'd have to change in the other one too.

mighty_dev · Accepted Answer · 2020-06-27 14:33:35Z

0

Define a constant before including the file and then check if that constant is defined in default.php.It would be something like below:

1.php:

<?php

define('AVOID_ALERT_1',1);

require_once('default.php');

2.php:

<?php

define('AVOID_ALERT_2',1);

require_once('default.php');

default.php:

<?php 

// __some__codes

if(!(defined('AVOID_ALERT_1') || defined('AVOID_ALERT_2'))){
   echo $comn_alert = "<script>alert('Hi');</script>";
}

answered Jun 27, 2020 at 14:33

mighty_dev

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