Blue Belt … Onlykiosk Coding …

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Cross-File Communication

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how to assemble two files together

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how to assemble two files together
echo “Hello,”
?>
echo “OnlyKiosk!
?>

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require( )
include( )
Cross-File Communication

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include() and require() are basically identical, the difference is how they handle failures:
require() will produce a fatal error (E_COMPILE_ERROR) and stop the script
include() will only produce a warning (E_WARNING) and the script will continue
(http://www.w3schools.com/php/php_includes.asp)

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require_once( )
assembling two files together
loading files consumes system resources,
one file should be loaded only once.
???

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URL + file name
require_once( )

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“file name”
require_once( )
‘./file name’
the two files are in the SAME file folder
. /
means the current file folder

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but most of the time, the two files are NOT in the same file folder…

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url
absolute URL
relative URL
Absolute URL: www folder, disc: c
Relative URL: go to the parent file folder and then go to…
You Should Always Use Relative URL

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../
../street_2/ blue_file.php

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../
../
../../city_2/street_3/ red_file.php

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www/ blue/earth/ url.php
www/ blue/ moon/ function.php
../ means go back to the previous level
Keep using ../ to go back to the previous level until reaching the folder where both the two files come from-- blue;
Then add the rest of the URL of the file to be linked;
Level 1
Level 2
Level 3