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<?php $name="why";//声明变量$name,并初始化 function echoName1() { //在函数echoName1()里使用global来声明$name global $name; echo "the first name is ".$name."<br>"; } function echoName2() { //在函数echoName2()里没有使用global来声明$name echo "the second name is ".$name."<br>"; } echoName1(); echoName2(); $last_name = "O'Keefe"; echo $sql = "select * from users where last_name = '" . addslashes($last_name) . "'";
Output for git.master, git.master_jit, rfc.property-hooks
the first name is why<br> Warning: Undefined variable $name in /in/11aEF on line 16 the second name is <br>select * from users where last_name = 'O\'Keefe'

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