Question 55680 in PHP Question posted in
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Use regular expressions to extract PHP variable names from blade template?

I need to extract php variables from Blade templates. The issue is that I can’t figure out how to exclude variables created within foreach loops.

{{ $ok }}
{{$alsoOK}}
@foreach($yes as $no)
{{ $no }}
{{ $no->foo }}
@endforeach

So for the above code, I’d like to extract:

$ok
$alsoOK
$yes

but don’t extract $no.

My regex is failing me and I can’t quite tell why.

~[({][s]?($[A-Za-z0-9_]*)[s]?[)}]?~img almost does it, but it also captures the first $no after the foreach loop.

I appreciate the help in advance.

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2

Answers


  1. 0

    As I already said – regexp is the right tool for the job here. I prefer this approach – it’s simpler and easier to maintain.

    <?php
$template = <<<EOT
{{     $ok }}
{{$alsoOK}}
@foreach($yes as $no)
{{ $no }}
{{ $no->foo }}
@endforeach
EOT;

$lines = explode("n", $template);

$variables = [];
$inForeach = false;

foreach ($lines as $line) {
  if (!$inForeach && preg_match_all('/{{2}s*$([a-zd_]+)s*}{2}/i', $line, $matches)) {
    $variables = array_merge($variables, $matches[1]);
  } elseif (preg_match('/@foreach($([a-zd_]+)s+ass+$([a-zd_]+))/i', $line, $matches)) {
    $inForeach = true;
    $variables[] = $matches[1];
  } elseif (preg_match('/@endforeach/i', $line)) {
    $inForeach = false;
  }
}

$variables = array_unique($variables);

print_r($variables);

    harvests all the variables, but ignores those within @foreach block:

    Array
(
   [0] => ok
   [1] => alsoOK
   [2] => yes
)
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  2. 0

    I would suggest iterating over each line of the template and only extract the variables of each line.
    This way you could easily skip those lines, that appear within a foreach loop.

    Another advantage of this approach would be writing better readable and maintainable code.

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