extracting (parsing) a string to pieces
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
[{CONTENT:meta}]
[{CONTENT:title}]
[{CONTENT:head}]
</head>
[{CONTENT:open_body}]
<p>[{LOCATION:main_1}]</p>
<p>[{LOCATION:main_1}]</p>
</body>
</html>
I have the above "template_file" in a $string开发者_高级运维. I am trying to do a loop that cycle through the string and on each iteration gives me the left side of the tag, the tag itself in a new variable, and then the right side in another string. I can't use str_replace here because I need to extract what's inside of the tags before replacing them.
The output would be something like:
$string_left = everything up to a "[{"
$command = "CONTENT:meta"
$string_right= everything after the "}]".
I would then process data using the CONTENT:meta and then put the thing back together (string_left + new data + string_right) and then keep doing it until the entire thing was parsed.
You can do this with a relatively simple regular expression:
$inputString = "left part of string [{inner command}] right part of string";
$leftDelim = "\[\{";
$rightDelim = "\}\]";
preg_match("%(.*?)$leftDelim(.*?)$rightDelim(.*)%is", $inputString, $matches);
print_r($matches);
This will demonstrate how to use the regular expression. The extra slashes in the delim variables are because your delimiters use regex characters, so you need to escape them.
You can use preg_replace with a regex that matches [{...}], along with a replacer function that takes the matched "command" and returns a suitable replacement string:
$output = preg_replace('/\[{([^}]*)}\]/e', 'my_replacer(\'$1\')', $string);
And define my_replacer as follows:
function my_replacer($command) {
...
return $replacement;
}
Why don't you just use a template software instead? Here's a big list.
http://www.webresourcesdepot.com/19-promising-php-template-engines/
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