PHP Classes

PHP Utilities: Evaluate math expressions, PHP templates, etc..

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This class can evaluate math expressions, PHP templates, command line parameters, and parse PHP.

It can take a string with a math expression and evaluate it to compute the result value.

The class can also take template data string and find PHP code it may contains to replace by its output.

It can also parse a string with command line interface parameters and replace them by their parameter values.

The class can also parse PHP code and extract its tokens.

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PHP is very well known for being a template language. It can automatically process the output of a template script and combine with the output of the PHP code contained in the template.

However, there are some cases on which you may extract only the output of the code in the template and process it separately. This class provides means to achieve exactly that, so the script output can be evaluated in a different context of the current scope.

The class also provides other features that overcome PHP limitations.

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        This example demonstrates the use of the EvaluateExpression() method, using different
        expressions, valid or not.

require_once ( '../PhpUtilities.phpclass' ) ;

     if (
php_sapi_name ( ) != 'cli' )
        echo (
'<pre>' ) ;

$expressions = array
'17 * 4', // no error
'99*', // generates a fatal error
'4 * 32', // no error
'UNDEFINED_CONSTANT * 12' // generates a notice message
) ;

"Evaluation results :\n" ;
"------------------\n" ;
    foreach (
$expressions as $expression )
sprintf ( "%-24s", $expression ) . " : " ;

$status = PhpUtilities::EvaluateExpression ( $expression, $result, $error ) ;

// Returned status is true : the expression evaluated correctly
if ( $status )
$result ;
// Status = false : the expression generated a fatal error (such as parsing error) or notice/error message
        // In this case, the error message is available in the supplied $error variable
"(error) $error" ;

"\n" ;

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Plain text file PhpUtilities.phpclass Class Class source
Accessible without login Plain text file Doc. Documentation
Plain text file Regex.class.php Class Class source

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  Accessible without login Plain text file evaluateexpression.ini Data Auxiliary data
  Accessible without login Plain text file evaluateexpression.php Example Example script
  Accessible without login Plain text file evaluatetags.php Example Example script 29KB
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