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This question has to do with the internal mechanics of the PHP engine. I'm asking it in an effort to understand the file include process.
Say, you got a 20,000 lines include file ( something like "functions_library.php" ) that gets included on all your php scripts.
Does PHP check/verify if that include file is syntactically correct every single time one of your php scripts load that file? Does this process happen at each page load over and over and over again?
Or...
Does PHP pay attention to the file's last modification date? If it turns out that there were no changes to it since the last check, does it simply ignore the checking?
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PHP Include Files. The include (or require ) statement takes all the text/code/markup that exists in the specified file and copies it into the file that uses the include statement. Including files is very useful when you want to include the same PHP, HTML, or text on multiple pages of a website.
You need to try the path of functions. php within the system and not its url. Do you have console access? If so just find out what directory is the file in and include it using the full path.
Yes it will slowdown if you are including the script from other servers.
Here, the PHP include statement shows a way that is easy to implement and advantageous. Including a file in PHP is as simple as writing the include statement followed by the required file name. But remember that the file must be present in the same folder as your current file.
The include (or require) statement takes all the text/code/markup that exists in the specified file and copies it into the file that uses the include statement. Including files is very useful when you want to include the same PHP, HTML
If you called include_once () more than once giving it same file path, it would only include the file once. But include () may include the file each time you call it. require () behaves as same as include ().
PHP include vs. require. The require statement is also used to include a file into the PHP code. However, there is one big difference between include and require; when a file is included with the include statement and PHP cannot find it, the script will continue to execute:
On a default installation, the file will be parsed every single time. However, any production installation of PHP is recommended to have a bytecode cache, such as APC or many others. When bytecode cache is used, the script is parsed the first time and the interpreted code will be stored in memory.
Different configurations may alter how often file modifications are checked. Under some configurations, for very high performance, manual flushing or restarting the web server may be required.
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If you include that file, PHP will need to interpret it every time.
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