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    ▪实例详解http_build_query函数的用法      本文主要内容： 详解http_build_query函数的用法 http_build_query 函数 (PHP 5) http_build_query -- 生成 url-encoded 之后的请求字符串描述string http_build_query ( array formdata [, string numeric_prefix] ) 使用给出的关联.........

    ▪php删除一组文件的例子      本文主要内容： 根据checkbox复选框选择多个内容进行删除操作，学习下php删除一组文件的方法。 1，静态页 form.html   代码示例: <!-- These files must exist to work (This is only an example) --> <form.........

    ▪PHP将数字转换为罗马字符的实例代码      本节主要内容： php实现数字转换为罗马字符的代码。 例子：   代码示例: <?PHP /* Decimal <--> Roman 1.1 用到了二个函数 string dec2roman (integer $number) where $number is a number you want to convert t.........

代码示例:

<?php
$data = array('foo'=>'bar',
              'baz'=>'boom',
              'cow'=>'milk',
              'php'=>'hypertext processor');
echo http_build_query($data);
/* 输出：
       foo=bar&baz=boom&cow=milk&php=hypertext+processor
*/
?>

代码示例:

<?php
$data = array('foo', 'bar', 'baz', 'boom', 'cow' => 'milk', 'php' =>'hypertext processor');
echo http_build_query($data);
/* 输出：
       0=foo&1=bar&2=baz&3=boom&cow=milk&php=hypertext+processor
*/
echo http_build_query($data, 'myvar_');
/* 输出：
       myvar_0=foo&myvar_1=bar&myvar_2=baz&myvar_3=boom&cow=milk&php=hypertext+processor
*/
?>

代码示例:

<?php
$data = array('user'=>array('name'=>'Bob Smith',
                            'age'=>47,
                            'sex'=>'M',
                            'dob'=>'5/12/1956'),
              'pastimes'=>array('golf', 'opera', 'poker', 'rap'),
              'children'=>array('bobby'=>array('age'=>12,
                                               'sex'=>'M'),
                                'sally'=>array('age'=>8,
                                               'sex'=>'F')),
              'CEO');
echo http_build_query($data, 'flags_');
/* 输出：（为了可读性对其进行了折行）
       user[name]=Bob+Smith&user[age]=47&user[sex]=M&user[dob]=5%1F12%1F1956&
       pastimes[0]=golf&pastimes[1]=opera&pastimes[2]=poker&pastimes[3]=rap&
       children[bobby][age]=12&children[bobby][sex]=M&children[sally][age]=8&
       children[sally][sex]=F&flags_0=CEO //www.
    注意：只有基础数组中的数字下标元素“CEO”才获取了前缀，其它数字下标元素（如
    pastimes 下的元素）则不需要为了合法的变量名而加上前缀。
*/
?>

代码示例:

<?php
class myClass {
   var $foo;
   var $baz;
   function myClass() {
    $this->foo = 'bar';
    $this->baz = 'boom';
   }
}
$data = new myClass();
echo http_build_query($data);
/* 输出：
       foo=bar&baz=boom
*/
?>

代码示例:

<!-- These files must exist to work (This is only an example) -->
<form action="/blog_article/process.html" method="post">
    <input type="checkbox" value="file1.html" name="delete[]"> file1.html<br>
    <input type="checkbox" value="file2.html" name="delete[]"> file2.html<br>
    <input type="checkbox" value="file3.html" name="delete[]"> file3.html<br>
    <input type="submit" value="Delete Selected" name="submit">
</form>

代码示例:

<?php
# Take each checked value, and give it a name of $delete
foreach($_POST['delete'] as $delete){
    # Make sure the file actually exists
    if(file_exists("/location/of/directory/".$delete)){
        # Delete each file
        unlink("/location/of/directory/",$delete);
    }else{
        continue;
    }
}
# Return to form.html
header("Location: form.html");
?>

代码示例:

<?PHP
/*
Decimal <--> Roman 1.1
用到了二个函数

string dec2roman (integer $number)
where $number is a number you want to convert to a roman one.

integer roman2dec (string $linje)
where $linje is the roman number you want to conver to an integer.

edit: www.
*/

function dec2roman ($number) {
    # Making input compatible with script.
    $number = floor($number);
    if($number < 0) {
        $linje = "-";
        $number = abs($number);
    }

    # Defining arrays
    $romanNumbers = array(1000, 500, 100, 50, 10, 5, 1);
    $romanLettersToNumbers = array("M" => 1000, "D" => 500, "C" => 100, "L" => 50, "X" => 10, "V" => 5, "I" => 1);
    $romanLetters = array_keys()($romanLettersToNumbers);

    # Looping through and adding letters.
    while ($number) {
        for($pos = 0; $pos <= 6; $pos++) {

            # Dividing the remaining number with one of the roman numbers.
            $dividend = $number / $romanNumbers[$pos];

            # If that division is >= 1, round down, and add that number of letters to the string.
            if($dividend >= 1) {
                $linje .= str_repeat($romanLetters[$pos], floor($dividend));

                # Reduce the number to reflect what is left to make roman of.
                $number -= floor($dividend) * $romanNumbers[$pos];
            }
        }
    }

    # If I find 4 instances of the same letter, this should be done in a different way.
    # Then, subtract instead of adding (smaller number in front of larger).
    $numberOfChanges = 1;
    while($numberOfChanges) {
        $numberOfChanges = 0;

        for($start = 0; $start < strlen($linje); $start++) {
            $chunk = substr($linje, $start, 1);
            if($chunk == $oldChunk && $chunk != "M") {
                $appearance++;
            } else {
                $oldChunk = $chunk;
                $appearance = 1;
            }

            # Was there found 4 instances.
            if($appearance == 4) {
                $firstLetter = substr($linje, $start - 4, 1);
                $letter = $chunk;
                $sum = $firstNumber + $letterNumber * 4;

                $pos = array_search($letter, $romanLetters);

                # Are the four digits to be calculated together with the one before? (Example yes: VIIII = IX Example no: MIIII = MIV
                # This is found by checking if the digit before the first of the four instances is the one which is before the digits in the order
                # of the roman number. I.e. MDCLXVI.

                if($romanLetters[$pos - 1] == $firstLetter) {
                    $oldString = $firstLetter . str_repeat($letter, 4);
                    $newString = $letter . $romanLetters[$pos - 2];
                } else {
                    $oldString = str_repeat($letter, 4);
                    $newString = $letter . $romanLetters[$pos - 1];
                }
                $numberOfChanges++;
                $linje = str_replace()($oldString, $newString, $linje);
            }
        }
    }
    return $linje;
}

function roman2dec ($linje) {
    # Fixing variable so it follows my convention
    $linje = strtoupper()($linje);

    # Removing all not-roman letters
    $linje = ereg_replace("[^IVXLCDM]", "", $linje);

    print("\$linje  = $linje<br>");

    # Defining variables
    $romanLettersToNumbers = array("M" => 1000, "D" => 500, "C" => 100, "L" => 50, "X" => 10, "V" => 5, "I" => 1);

    $oldChunk = 1001;

    # Looping through line
    for($start = 0; $start < strlen($linje); $start++) {
        $chunk = substr($linje, $start, 1);

        $chunk = $romanLettersToNumbers[$chunk];

        if($chunk <= $oldChunk) {
            $calculation .= " + $chunk";
        } else {
            $calculation .= " + " . ($chunk - (2 * $oldChunk));
        }

        $oldChunk = $chunk;
    }

    # Summing it up
    eval("\$calculation = $calculation;");
    return $calculation;
}

# Implementation of the array_search function. Works only with numerical arrays.
function array_search($searchString, $array) {
    foreach ($array as $content) {
        if($content == $searchString) {
            return $pos;
        }
        $pos++;
    }
}
?>