PHP中include和require的区别实例分析
先编辑command.php文件
echo'hello'.PHP_EOL;
然后编辑console.php文件
for($i=1;$i<=3;++$i){
require'command1.php';
}
原本想要包含并执行这个echo，没想到写错了文件名，如果是require，会报出这样的错误：
Warning:require(command1.php):failedtoopenstream:Nosuchfileordirectoryinconsole.phponline4 Fatalerror:require():Failedopeningrequired'command1.php'(include_path='.')inconsole.phponline4 PHPWarning:require(command1.php):failedtoopenstream:Nosuchfileordirectoryinconsole.phponline4 PHPFatalerror:require():Failedopeningrequired'command1.php'(include_path='.')inconsole.phponline4
如果把require改为include
for($i=1;$i<=3;++$i){
include'command1.php';
}
会报出这样的错误：
Warning:include(command1.php):failedtoopenstream:Nosuchfileordirectoryinconsole.phponline4 Warning:include():Failedopening'command1.php'forinclusion(include_path='.')inconsole.phponline4 Warning:include(command1.php):failedtoopenstream:Nosuchfileordirectoryinconsole.phponline4 Warning:include():Failedopening'command1.php'forinclusion(include_path='.')inconsole.phponline4 Warning:include(command1.php):failedtoopenstream:Nosuchfileordirectoryinconsole.phponline4 Warning:include():Failedopening'command1.php'forinclusion(include_path='.')inconsole.phponline4 PHPWarning:include(command1.php):failedtoopenstream:Nosuchfileordirectoryinconsole.phponline4 PHPWarning:include():Failedopening'command1.php'forinclusion(include_path='.')inconsole.phponline4 PHPWarning:include(command1.php):failedtoopenstream:Nosuchfileordirectoryinconsole.phponline4 PHPWarning:include():Failedopening'command1.php'forinclusion(include_path='.')inconsole.phponline4 PHPWarning:include(command1.php):failedtoopenstream:Nosuchfileordirectoryinconsole.phponline4 PHPWarning:include():Failedopening'command1.php'forinclusion(include_path='.')inconsole.phponline4
如果使用require_once或者include_once，只要包含路径正确，那么循环只执行一次。
总结：
使用require，如果文件没有包含成功，就会报出一个fatalerror，整个程序就中止了。
使用include，如果文件没有包含成功，就会报出一个普通的warning，之后的代码仍会执行。
如果你的Web程序使用了MVC这种对文件包含强依赖的设计方法，请使用require_once。