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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 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
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'
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
the first name is why<br> Notice: Undefined variable: name in /in/11aEF on line 16 the second name is <br>select * from users where last_name = 'O\'Keefe'
Output for 7.3.32 - 7.3.33
the first name is why<br>the second name is <br>select * from users where last_name = 'O\'Keefe'
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
the first name is why<br> Notice: 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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