regardez this code:
print pewt( "hello!" );
function pewt( $arg )
{
include( "some_code.inc" );
}
some_code.inc:
return strtoupper( $arg );
.. after much hair pulling, discovered why nothing was being returned by the "some_code.inc" code in the function .. the return simply returns the result TO the function (giving the include function a value), not to the CALLING (print pewt). This works:
print pewt( "hello!" );
function pewt( $arg )
{
return include( "some_code.inc" );
}
So, RETURN works relative to block it is executed within.
return
如果在一个函数中调用 return() 语句，将立即结束此函数的执行并将它的参数作为函数的值返回。return() 也会终止 eval() 语句或者脚本文件的执行。
如果在全局范围中调用，则当前脚本文件中止运行。如果当前脚本文件是被 include() 的或者 require() 的，则控制交回调用文件。此外，如果当前脚本是被 include() 的，则 return() 的值会被当作 include() 调用的返回值。如果在主脚本文件中调用 return()，则脚本中止运行。如果当前脚本文件是在 php.ini 中的配置选项 auto_prepend_file 或者 auto_append_file 所指定的，则此脚本文件中止运行。
更多信息见返回值。
注意: 注意既然 return() 是语言结构而不是函数，仅在参数包含表达式时才需要用括号将其括起来。当返回一个变量时通常不用括号，也建议不要用，这样可以降低 PHP 的负担。
注意: 当用引用返回值时永远不要使用括号，这样行不通。只能通过引用返回变量，而不是语句的结果。如果使用 return ($a); 时其实不是返回一个变量，而是表达式 ($a) 的值（当然，此时该值也正是
$a的值）。
add a note
User Contributed Notes
Spacecat
25-Jul-2007 01:13
25-Jul-2007 01:13
warhog at warhog dot net
18-Dec-2005 08:28
18-Dec-2005 08:28
for those of you who think that using return in a script is the same as using exit note that: using return just exits the execution of the current script, exit the whole execution.
look at that example:
a.php
<?php
include("b.php");
echo "a";
?>
b.php
<?php
echo "b";
return;
?>
(executing a.php:) will echo "ba".
whereas (b.php modified):
a.php
<?php
include("b.php");
echo "a";
?>
b.php
<?php
echo "b";
exit;
?>
(executing a.php:) will echo "b".
mike at uwmike dot com
06-Dec-2005 05:25
06-Dec-2005 05:25
If you have a class file that's getting out of control, you can set it up like so:
<?php
class myClass {
function do_this($a, $b) { return require(myClass_do_this.php); }
function do_that($a, $b, $c) { return require(myClass_do_that.php); }
}
?>
Might not be for everyone, but it's workable, readable, and keeps the source files shorter.