Detailed explanation of how to use php include
include statement includes and runs the specified file.
The following documents also apply to require.
If a path is defined - whether it is an absolute path (starting with a drive letter or \ under Windows, and / under Unix/Linux) or a relative path to the current directory (starting with . or ..) --include_path will be completely ignored. For example, if a file begins with ../, the parser will look for the file in the parent directory of the current directory. For more information on how PHP handles include files and include paths, see the documentation in the include_path section. When a file is included, the code contained in it inherits the php include function should be our most commonly used method. The include() statement includes and runs the specified file. But just because of this, we may have overlooked some of its other uses. I read it again because of work needs, and will make a brief record here: 1. The simple difference between include and require When the file included in include does not exist, it only generates a warning, but the script will continue to execute. If the file referenced by require does not exist, an error will be prompted and the script will be terminated. 2. Variable scope of variables in the included file When a file is included, the code contained in it inherits the variable scope of the line where include is located. If include appears within a function in a calling file, all code contained in the called file will behave as if it were defined inside that function. However, all functions and classes defined in include files have global scope. When a file is included, the parser leaves PHP mode and enters HTML mode at the beginning of the target file, and resumes at the end of the file. For this reason, any code in an object file that should be executed as PHP code must be included within valid PHP start and end tags. 3.include() return valueIf you obtain the variable value in include, you need to add returnFor example: file return.php<?php $var='ok'; return $var; ?>if( include('return.php')=='ok' ) { ... } if does not execute the inside because the include('return.php') value is 1 if( (include 'return.php')=='ok' ) { ... } if can execute the inside, so if you use include for conditional comparison, you need to do this (include 'return.php') 4. Use output buffering to include the PHP file into a
<?php $string = get_include_contents('somefile.php'); function get_include_contents($filename) { if (is_file($filename)) { ob_start(); include $filename; $contents = ob_get_contents(); ob_end_clean(); return $contents; } return false; } ?>1. Include some class definition files, function files, This is commonly used;2. Contain HTML files
include "header.htm";The header.htm above can be integrated with PHP statements.
$i = include 'abc.php';abc.php source code example:
<?php return "hello world"; ?>Then echo $i; will output hello world.If abc.php does not return, then echo $i will output the variable range of 1include
$a="hello world"; include "abc.php";$a is visible in abc.php;The variables in abc.php are also visible after include; the usage is very flexible!
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