php , is it variable or constant [closed] - php

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i want to add li element to this page,
this website was done by someone else
the index.php file include several php files, along with them main.php.
this is the code for main.php
<div class="center"><p class="text3"><?php echo LABEL_TXT_FORNT_PAGE_TITLE;?></p>
<div class="netw"><div>
<div class="title"><?php echo LABEL_TXT_KDMATY;?></div></div>
<p><img src="img/<?php echo $dir;?>/1.jpg" border='1' alt="img" /></p>
<p class="text1"><?php echo TXT_CONTANT_FOR_KDAMATY;?> </p>
<p class="text2"></p>
</div>
<div class="suppserv"><div>
<div class="title"><?php echo LABEL_TXT_CHECK_PRINTING;?></div></div>
<p><img src="img/<?php echo $dir;?>/2.jpg" border='1' alt="img" /></p>
<p class="text1"><?php echo TXT_CONTANT_FOR_PRINT;?>
</p>
<p class="text2"></p></div>
<div class="remote"><div>
<div class="title"><?php echo LABEL_TXT_POINT_OF_SALES;?></div></div>
<p><img src="img/<?php echo $dir;?>/3.jpg" border='1' alt="img" /></p>
<p class="text1"><?php echo TXT_CONTANT_FOR_SALES;?></p>
<p class="text2"></p></div>
</div>
<div class="line"><img src="img/12.png" alt="img" /></div>
<div class="center2">
<div class="netw">
<p class="text4"><?php echo LABEL_TXT_EXPER;?></p>
<p class="text5"><?php echo TXT_CONTANT_EXPER;?></p>
<ul>
<li><?php echo UL_EXPER_EX1;?></li>
<li><?php echo UL_EXPER_EX2;?></li>
<li><?php echo UL_EXPER_EX3;?></li>
<li><?php echo UL_EXPER_EX4;?></li>
<li><?php echo UL_EXPER_EX5;?></li>
</ul>
<p class="text2"><a href="<?php echo SITE_URL; ?>/expertise.php"><?php echo
LABEL_TXT_MORE_LINKS;?><img alt="img" src="img/<?php echo $dir;?>/11.png"></a></p>
<div class="clear"></div>
</div>
<div class="remote">
<p class="text4"><?php echo LABEL_TXT_CUSTOMER;?></p>
<p class="text5"><?php echo TXT_CONTANT_CUSTOMER;?></p>
<ul>
<li><?php echo UL_CUSTOMER_EX1;?></li>
<li><?php echo UL_CUSTOMER_EX2;?></li>
<li><?php echo UL_CUSTOMER_EX3;?></li>
<li><?php echo UL_CUSTOMER_EX4;?></li>
<li><?php echo UL_CUSTOMER_EX5;?></li>
</ul>
</div>
<div class="suppserv">
<p class="text4"><?php echo LABEL_TXT_OUR_SERVICES;?></p>
<p class="text5"><?php echo TXT_CONTANT_SERVICES;?></p><br />
</div>
</div>
note this line :
<li><?php echo UL_CUSTOMER_EX1;?></li>
can someone explain to me what is this, it is not variable and not a constant, so what is it ?

Answer 1

You can define constants in php like this
define("MY_VARIABLE", 6)
And then access anywhere on the script:
echo MY_VARIABLE; // print 6
Is the same that LABEL_TXT_OUR_SERVICES

Answer 2

This is a constant, note that it hasn't the dollar sign before.
Refer to this http://php.net/manual/pt_BR/function.define.php
That constant was declared by using
define("UL_CUSTOMER_EX1", 'some_value_or_var');

Answer 3

Variables' first character is $ sign in PHP.
$var1 = 0; //this is a variable
define('CONST', 100); // is a constant
You can use $var1 and CONST in the page with one difference: $var1's value may be changed programatically but constansts no. Value of CONST cannot change during the execution of the script

Answer 4

That there is a constant. It must have been define()'d somewhere previously, possibly in an included file.
If I were you, I'd search for any define() statements that contain UL_CUSTOMER_EX1.

Answer 5

Yes, i agree with everybody else's opinion: it's a constant defined inside one of the included files.
BUT!
There might be another possibility, which may be probable if the original author is a novice developer:
an UNDEFINED constant, being treated as a string by default from php without warnings enabled.
Because, in PHP, if you use a constant which is undefined, it is reverted to a string which contains the constant name (eg: UNK_CONST becomes the string "UNK_CONST"). Of course it gives a warning too, but warnings may have been suppressed.