ComposerJson.php

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<?php
 
class ComposerJson {
    private $contents;
 
    public function __construct( $location ) {
        $this->contents = json_decode( file_get_contents( $location ), true );
    }
 
    public function getRequiredDependencies() {
        $deps = [];
        if ( isset( $this->contents['require'] ) ) {
            foreach ( $this->contents['require'] as $package => $version ) {
                if ( $package !== "php" && strpos( $package, 'ext-' ) !== 0 ) {
                    $deps[$package] = self::normalizeVersion( $version );
                }
            }
        }
 
        return $deps;
    }
 
    public static function normalizeVersion( $version ) {
        if ( strpos( $version, 'v' ) === 0 ) {
            // Composer auto-strips the "v" in front of the tag name
            $version = ltrim( $version, 'v' );
        }
 
        return $version;
    }
 
}