How does include('./code.php');
work? I understand it is the equivalent of having the code "pasted" directly where the include occurs, but, for example:
If I have two pages, page1.php
and page2.php
, of which I would need to manipulate different variables and functions in ./code.php
, does include()
create a copy of ./code.php
, or does it essentially link back to the actual page ./code.php
?
The only difference is — the include() statement will only generate a PHP warning but allow script execution to continue if the file to be included can't be found, whereas the require() statement will generate a fatal error and stops the script execution.
The PHP Include Path is a set of locations that is used for finding resources referenced by include/require statements. Note: Adding libraries or external projects elements to your project's Include Path will also make elements defined in these resources available as content assist options.
See the manual.
If you include
a text file, it will show as text in the document.
include
does not behave like copy-paste:
test.php
<?php
echo '**';
$test = 'test';
include 'test.txt';
echo '**';
?>
test.txt
echo $test;
The example above will output:
**echo $test;**
If you are going to include PHP files, you still need to have the PHP tags <?php
and ?>
.
Also, normally parentheses are not put after include
, like this:
include 'test.php';
Basically, when the interpreter hits an include 'foo.php';
statement, it opens the specified file, reads all its content, replaces the "include" bit with the code from the other file and continues with interpreting:
<?php
echo "hello";
include('foo.php');
echo "world";
becomes (theoretical)
<?php
echo "hello";
?>
{CONTENT OF foo.php}
<?php
echo "world";
However, all this happens just in the memory, not on the disk. No files are changed or anything.
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