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23 lines
770 B
23 lines
770 B
<?php
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/*
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* 自动加载的机制是，
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* 当一个类new实例化时，若在当前文件找不到这个类，包括include的文件里也找不到这个类
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* 就会触发sql_autoload_register,
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* sql_autoload_register里执行include_once去包含以这个与类名命名的文件
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* 所以类文件的名称需要与类名相同
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*/
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spl_autoload_register
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(
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function($className)
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{
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include_once("./{$className}.php");
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}
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);
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$obj = new classA(); //因为classA在autoload.php中未定义，当new时，会自动调用spl_autoload_register函数，并且传递类名
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echo $obj->str.PHP_EOL;
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$obj2 = new classB();
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echo $obj2->str.PHP_EOL; //找不到文件./classB.php
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?>
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