用PHP写出计算器

<body>
    <?php
    if (!empty($_POST)) {
        $op=$_POST['point'];
        $sum1 = $_POST['sum1'];
        $sum2 = $_POST['sum2'];
        $sum = 0;
        if ($sum1 != '' && is_numeric($sum1) && $sum2 != '' && is_numeric($sum2)) {
            switch ($op) {
                case '+':
                    $sum = $sum1 + $sum2;
                    break;
                case '-':
                    $sum = $sum1 - $sum2;
                    break;
                case '*':
                    $sum = $sum1 * $sum2;
                    break;
                case '/':
                    $sum = $sum1 / $sum2;
                    break;
            }
            echo <<<shi
            <script>
                window.onload = function() {
                    document.getElementsByName('sum3')[0].setAttribute('value', '$sum')
                    document.getElementsByName('sum1')[0].setAttribute('value', '$sum1')
                    document.getElementsByName('sum2')[0].setAttribute('value', '$sum2')
                    document.getElementsByName('{$op}')[0].setAttribute('selected','selected')
                }
            </script>
shi;
        } else {
            echo '输入内容必须是数字';
        }
    };
    ?>
    <form action="" method='post'>
        <input type="text" name="sum1">
        <select name='point'>
            <option name='+'>+</option>
            <option name='-'>-</option>
            <option name='*'>*</option>
            <option name='/'>/</option>
        </select>
        <input type="text" name='sum2'>
        <input type="submit" name='button' value='='>
        <input type="text" name='sum3'>
    </form>
</body>

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转载自www.cnblogs.com/shineguang/p/10964677.html