使用php函数对数值索引数组的元素进行分级

我打算使用函数调用对php中数字索引数组的元素进行分级；我的函数调用不起作用：它没有对元素进行分级，我无法找出代码中的错误。请帮助 提前谢谢

 <?php

//function intended to  grade array elements

    function gradeArray($x){
        if($score>= 70){
    echo"A";


     }


       elseif($score >= 50){


     echo"B";
    }
    elseif($score>= 40){


     echo"C";


     }


     else{
    echo"F";


     }
    }

    // Array of Scores to be graded


      $scores = array ("55", "68", "43", "78");
//Display result in a tabular form


     echo"<table  border = '1'><th>Score</th><th>Grade</th>";

    foreach($scores as $score){



     echo"<tr><td>";



      echo$score."</td>";

    echo"<td>". gradeArray($score);

    echo"</td></tr>";



      }



       echo"</table>";

    ?>

---

数组元素为字符串。请使用将所有元素转换为int

    gradeArray($x){
$score=(int)$x;
}

试试这个，它会起作用的。首先，由于使用了$x，很可能函数中未定义$score

然后使用if条件，就好像$score>=70{

另外，在返回值中，只需使用return

使用return not echo，以便此连接echo.gradeArray$score；工作。

$score在变量中未定义，函数将变量提取为$x。尝试将$score更改为$x或定义$score。您也可以在函数中使用全局$score。此外，您应该返回值，而不是使用echo。请使用下面的代码

<?php

//function intended to  grade array elements

    function gradeArray($x){
$score=$x;
        if($score>= 70){
    return "A";


     }


       elseif($score >= 50){


     return "B";
    }
    elseif($score>= 40){


    return "C";


     }


     else{
    return "F";


     }
    }

    // Array of Scores to be graded


      $scores = array ("55", "68", "43", "78");
//Display result in a tabular form


     echo"<table  border = '1'><th>Score</th><th>Grade</th>";

    foreach($scores as $score){



     echo"<tr><td>";



      echo$score."</td>";

    echo"<td>". gradeArray($score);

    echo"</td></tr>";



      }



       echo"</table>";

    ?>

希望这对你有所帮助

试试这个

<?php

//function intended to  grade array elements

function gradeArray($x) {
    if ($x >= 70) {
        return "A";
    } elseif ($x >= 50) {

        return "B";
    } elseif ($x >= 40) {

        return "C";
    } else {
        return "F";
    }
}

// Array of Scores to be graded


$scores = array("55", "68", "43", "78");
//Display result in a tabular form


echo"<table  border = '1'><th>Score</th><th>Grade</th>";

foreach ($scores as $score) {



    echo"<tr><td>";



    echo$score . "</td>";

    echo"<td>" . gradeArray($score);

    echo"</td></tr>";
}



echo"</table>";
?>

---

您将$x传递到函数中，然后调用$score。 您的分数数组也是字符串格式，只需删除引号，使其成为数字。 同时将$x更改为$score，它应该可以正常工作！：

<?php
//function intended to  grade array elements
function gradeArray($score) {
   if     ($score >= 70)  return "A";
   elseif ($score >= 50)  return "B";
   elseif ($score >= 40)  return "C";
   else                   return "F";
}

// Array of Scores to be graded
$scores = array (55, 68, 43, 78);

//Display result in a tabular form
echo "<table border='1'><th>Score</th><th>Grade</th>";

foreach ($scores as $score) {
    echo "<tr><td>$score</td><td>" . gradeArray($score) . "</td></tr>";
}

echo "</table>";
?>

<?php

//function intended to  grade array elements

function gradeArray($x) {
    if ($x >= 70) {
        return "A";
    } elseif ($x >= 50) {

        return "B";
    } elseif ($x >= 40) {

        return "C";
    } else {
        return "F";
    }
}

// Array of Scores to be graded


$scores = array("55", "68", "43", "78");
//Display result in a tabular form


echo"<table  border = '1'><th>Score</th><th>Grade</th>";

foreach ($scores as $score) {



    echo"<tr><td>";



    echo$score . "</td>";

    echo"<td>" . gradeArray($score);

    echo"</td></tr>";
}



echo"</table>";
?>

<?php
//function intended to  grade array elements
function gradeArray($score) {
   if     ($score >= 70)  return "A";
   elseif ($score >= 50)  return "B";
   elseif ($score >= 40)  return "C";
   else                   return "F";
}

// Array of Scores to be graded
$scores = array (55, 68, 43, 78);

//Display result in a tabular form
echo "<table border='1'><th>Score</th><th>Grade</th>";

foreach ($scores as $score) {
    echo "<tr><td>$score</td><td>" . gradeArray($score) . "</td></tr>";
}

echo "</table>";
?>

function grading( $marks ){
    $grade = mysql_query("SELECT grade_name,grade_point FROM table_name **strong text**WHERE smark <= round($marks) AND hmark >= round($marks)");

     $gd = mysql_fetch_row( $grade );

     return $gd[0];
}