How to use require – include require_once and include_once in PHP
In this article we will learn how to use require – include require_once and include_once, PHP command to insert files
Hey you programmer, how are you? Let’s learn how to use requires and includes in PHP!
First, it is good to understand that these instructions are exclusively for adding files to another file in PHP
So here we go, first the difference between include and require: they do exactly the same function, but the type of error ends up being different when the instruction is not executed successfully
The require will terminate the execution of the script that is running, the include will only generate a warning and continue its execution
See the type of error generated by the instructions:
PHP Warning: include(): Failed opening 'file.php' for inclusion PHP Fatal error: require(): Failed opening required 'file.php'
Note that the warning will not stop your software, the Fatal Error will
The difference between include_once and require_once
Once again, the commands represent the same function, they will include the files determined by the parameter, so both have the same function
But the added functionality of the two once statements is that they ensure that a file is only included once in your software.
For example a page footer template, using once you ensure that only one footer is included
Also in these commands there is a confusion between single and double quotes, we recommend reading this article to understand them better 🙂
In this article we learned how to use require – include require_once and include_once in PHP
All instructions have the same objective: include a file to this PHP file that we are using the inclusion rule
The difference from the once statements is that they guarantee the inclusion of a given file at once
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