php include 和 require區別

剛接觸php不久，碰到include和require, 在網上查了很久，很多人也做了比較，有些不大正確，有誤導之嫌，最權威的正確的答案在這裡：http://cn. php.net/manual/zh/function.include.php。
看瞭如果還不明白的話，我做了以下測試， 
情況一： 
    include("./est.php"); // est.php不存在 
    echo "
. .."; 
?> 

測試結果： 
Warning: include(./est.php): failed to open stream: No such file or directory in .../test1.php on line 2 Warning: include() : Failed opening './est.php' for inclusion (include_path='.:/usr/local/Cellar/php/5.3.10/lib/php') in .../test1.php on line 2 
continue. .. 

情況二： 
    require("./est.php"); 
    echo "
continue..."; 
?>    echo "
continue..."; 
?>    echo "
continue..."; 
?>    echo "
continue..."; 
. est.php): failed to open stream: No such file or directory in .../test1.php on line 2 Fatal error: require(): Failed opening required './est.php' (include_path='.:/ usr/local/Cellar/php/5.3.10/lib/php') in .../test1.php on line 2 
此處continue字串沒有印出來。