Evalue

Store and execute PHP code snippets using Evalue class.

Features

• store PHP code for multiple executions;
• provide context variables during construction and execution;
• support for complex PHP code snippets;
• automatic stripping of <?php tags;
• variable scope isolation between runs;

Installation

composer require maximaster/evalue

Usage

Basic Usage

use Maximaster\Evalue\Evalue;

// Create an Evalue instance with PHP code
$evalue = new Evalue('return $number * 2;');

// Run the code with context
$result = $evalue->run(['number' => 21]); // Returns 42

With Constructor Context

$evalue = new Evalue(
    'return $greeting . " " . $name;',
    ['greeting' => 'Hello']
);

// Run with additional context
$result = $evalue->run(['name' => 'John']); // Returns "Hello John"

Complex Code Examples

// Multi-line code
$code = <<<'PHP'
    $sum = 0;
    for($i = 1; $i <= $max; $i++) {
        $sum += $i;
    }
    return $sum;
PHP;

$evalue = new Evalue($code);
$result = $evalue->run(['max' => 5]); // Returns 15

Context Overriding

$evalue = new Evalue(
    'return $name;',
    ['name' => 'John']
);

// Constructor context can be overridden in run()
$result = $evalue->run(['name' => 'Jane']); // Returns "Jane"

Security

⚠️ Warning: This library uses PHP's eval() function. Only use it with trusted code. Never execute user-provided code without proper validation and sanitization.

Context Rules

Variable names in the context must follow PHP's variable naming conventions:

• Must start with a letter or underscore
• Can contain letters, numbers, underscores
• Supports extended ASCII characters (e.g., π, área, über)

Invalid examples:

$evalue->run([
    '123name' => 'invalid',    // Invalid: starts with number
    'my-var' => 'invalid',     // Invalid: contains hyphen
    'my var' => 'invalid'      // Invalid: contains space
]);

Development / Contribution

composer test   # runs kahlan tests.
composer lint   # runs static analysis to check the code.
composer ci     # both test & lint.
composer fix    # automatically fixes some lint errors.