Insert Values after Compiler has passed Line
To start, I am using PHP with ob_start() and ob_flush.
In the code I have a part where parameters are suppose to be dynmacially loaded in the head of a file.
<head>
<script type="text/javascript" src="javascri开发者_C百科pt/ajax_objects.js"></script>
//Enter More Code Here Later
</head>
What I am trying to is after the compiler has finished and reach the end of the file, and found more libraries to add, is there a way where I can add more libraries to the part where it says //Enter More Code Here ? I know it is possible using Javascript/AJAX, but I am trying to do this with just php.
http://php.net/manual/en/function.ob-start.php
Example #1 describes exactly what you're trying to do: You could create a callback function called when you call ob_end_flush().
For instance:
<?php
function replaceJS($buffer) {
return str_replace("{JS_LIBS}", 'the value you want to insert', $buffer);
}
ob_start("replaceJS");
?>
<head>
<script>
{JS_LIBS}
</script>
</head>
<?php
ob_end_flush();
?>
The output in that case would be:
<head>
<script>
the value you want to insert
</script>
</head>
One option, would be to add a "marker". So replace //Enter More Code Here Later with <!-- HEADCODE-->.
Then, later on, when you're ready to send to the client (You mentioned using ob_flush()), simply do:
$headContent = ''; //This holds everything you want to add to the head
$html = ob_get_clean();
$html = str_replace('<!-- HEADCODE-->', $headContent, $html);
echo $html;
If you wanted to get fancy, you could create a class to manage this for you. Then, instead of doing ob_get_clean, just add a callback to ob_start.
class MyOutputBuffer {
$positions = array (
'HEAD' => '',
);
public function addTo($place, $value) {
if (!isset($this->positions[$place])) $this->positions[$place] = '';
$this->positions[$place] .= $value;
}
public function render($string) {
foreach ($this->positions as $k => $v) {
$string = str_replace('<!-- '.$k.'CODE-->', $v, $string);
}
return $string;
}
}
$buffer = new MyOutputBuffer();
ob_start(array($buffer, 'render'));
Then, in your code, just do $buffer->addTo('HEAD', '<myscript>');
加载中,请稍侯......
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