Variable name resolution in PHP custom strings

variable name resolution in PHP custom strings 

Such a requirement: the title of the page can be customized in the background, the custom content may contain variables, variables are represented by {$var}, where $var is the variable name

Put the title field into the database, and then put forward, with PHP's own variable name resolution is used, will be directly output {$var}, not as in the definition of strings, when using double quotation marks when the {$var} is automatically transformed into the corresponding variable content, this is like a single quote definition of the string, So you need to parse it yourself.

The idea here is to use regular expressions to extract all {$var} from the string, and then determine if there is a corresponding variable, and if so, replace the content with Str_replace ().

The procedure is as follows:

[PHP]View Plaincopy

2. <?php
4. $prefix = ' prefix ';
6. $name = ' subject name ';
8. $postfix = ' suffix ';
12. $title = ' {$prefix} {$name} Latest news {$postfix} ';
16. $match = Array ();
18. Preg_match_all ('/{\$ (. *?)}  /', $title, $match);
20. foreach ($match [1] as $key = + $value) {
22. if (isset ($$value)) {
24. $title = str_replace ($match [0][$key], $$value, $title);
26. }
28. }
30. echo $title;

Variable name resolution in PHP custom strings