有条件地分配一个值

I have this function:

function my_function($value1, $value2, $value3 = null){
    if($value1 || $value2 || $value3 == 'my_title' ){
        echo '<title>'.$value2.'</title>';
    }
}

my_function('my_css', 'my_title');

So as you can see I had to put in the echo $value2 becuase I cannot figure out how I would be able to use either $value 1,2 or 3. I was thinking this could be solved by doing something like this:

  if($value1 || $value2 || $value3 == 'my_title' $title = $value1 || $value2 || $value3 ){

Is this possible?

I hope you can understand what im trying to achieve here.

---------------------------------------------------- SOLVED --------------------------------------------------------

Thanks to rohitarora for the best answer for this question.

i would like to share with everyone what you have helped me make.

if you have this function

function template_content($value1, $value2, $value3 = null){ global $title;
$value = array($value1, $value2, $value3);
for($i=0;$i<count($value);$i++)
{
    if (strpos($value[$i],'title: ') === 0 ){
        $title = explode("title: ",$value[$i]);
        echo "\t", '<title>'.$title[1].'</title>', "
";
    } else if (strpos($value[$i],'css: ') === 0 ){
        $css = explode("css: ",$value[$i]);
        echo "\t", '<link rel="stylesheet" href="'.$css[1].'">', "
";
    } else if (strpos($value[$i],'js: ') === 0 ){
        $js = explode("js: ",$value[$i]);
        echo "\t", '<script src="'.$js[1].'"></script>', "
";
    }
}

}

you can call this function

<!DOCTYPE html>
<html>
<head>
<?php template_content('css: http://google.com/style.css', 'title: hello', 'js: http://code.jquery.com/jquery-latest.min.js'); ?>
</head>
<body>
</body>
</html> 

and you will get this amazing result

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" href="http://google.com/style.css">
    <title>hello</title>
    <script src="http://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
</body>
</html> 
function my_function($value1, $value2, $value3 = null) {
    // make a array of all your values
    $title = array($value1, $value2, $value3);
    // for loop will run as the size of array like here there are three element in array value1,2,3
    for ($i = 0; $i < count($title); $i++)
    {
        // check if the string is there in the ith element in array
        if ($title[$i] == 'my_title')
        {
            echo '<title>'.$title[$i].'</title>';
        }
    }
}

my_function('my_css', 'my_title');

Do it in array, that's a better way.

$string = 'my_title';

switch ($string) {
     case $value1 :         $title = $value1;         break;
     case $value2 :         $title = $value2;         break;
     case $value3 :         $title = $value3;         break;
}

echo '<title>'.$title.'</title>';

This is what you need :)

function my_function (){
    $args = func_get_args();

    foreach ($args as $arg){
        echo '<title>'.$arg.'</title>';
    }
}

my_function('my_css', 'my_title');

This function can take any number of params you give it, and will print every one inside tags

The statement

if ($value1 || $value2 || $value3 == 'my_title') {
     // Some code
}

does not return the result that you might think it will: it is evaluated as follows: if either $value1 is true (it is evaluated as it were a boolean), or $value2 is true, or $value3 equals my_title, then execute some code.

If you want to use either $value1, $value2 or $value3 when it equals my_title, use the following:

function my_function($value1, $value2, $value3 = null) {
    $searchStr = "my_title";
    $r = "";
    switch ($searchStr) {
        case $value1:
            $r = $value1;
            break;
        case $value2:
            $r = $value2;
            break;
        case $value3:
            $r = $value3;
            break;
    }
    echo '<title>'.$r.'</title>';
}

If you are allergic for switch statements (well, you really shouldn't!), then use this:

function my_function($value1, $value2, $value3 = null) {
    $searchStr = "my_title";
    $r = "";
    if ($value1 == $searchStr) {
        $r = $value1;
    }
    else if ($value2 == $searchStr) {
        $r = $value2;
    }
    else if ($value3 == $searchStr) {
        $r = $value3;
    }
    echo '<title>'.$r.'</title>';
}

Notice that it's better to return the result of a function rather than echoing it instantly.