src/Composer/Repository/Pear/PackageDependencyParser.php
private function buildDependency10Info($depArray)
    {
        static $dep10toOperatorMap = array('has' => '==', 'eq' => '==', 'ge' => '>=', 'gt' => '>', 'le' => '<=', 'lt' => '<', 'not' => '!=');

        $result = array();

        foreach ($depArray as $depItem) {
            if (empty($depItem['rel']) || !array_key_exists($depItem['rel'], $dep10toOperatorMap)) {
                // 'unknown rel type:' . $depItem['rel'];
                continue;
            }

            $depType = !empty($depItem['optional']) && 'yes' == $depItem['optional']
                ? 'optional'
                : 'required';
            $depType = 'not' == $depItem['rel']
                ? 'conflicts'
                : $depType;

            $depVersion = !empty($depItem['version']) ? $this->parseVersion($depItem['version']) : '*';

            // has & not are special operators that does not requires version
            $depVersionConstraint = ('has' == $depItem['rel'] || 'not' == $depItem['rel']) && '*' == $depVersion
                ? '*'
                : $dep10toOperatorMap[$depItem['rel']] . $depVersion;

            switch ($depItem['type']) {
                case 'php':
                    $depChannelName = 'php';
                    $depPackageName = '';
                    break;
                case 'pkg':
                    $depChannelName = !empty($depItem['channel']) ? $depItem['channel'] : 'pear.php.net';
                    $depPackageName = $depItem['name'];
                    break;
                case 'ext':
                    $depChannelName = 'ext';
                    $depPackageName = $depItem['name'];
                    break;
                case 'os':
                case 'sapi':
                    $depChannelName = '';
                    $depPackageName = '';
                break;
                default:
                    $depChannelName = '';
                    $depPackageName = '';
                    break;
            }

            if ('' != $depChannelName) {
                $result[] = new DependencyConstraint(
                    $depType,
                    $depVersionConstraint,
                    $depChannelName,
                    $depPackageName
                );
            }
        }

        return $result;
    }
private function buildDependency10Info($depArray)
    {
        static $dep10toOperatorMap = array('has' => '==', 'eq' => '==', 'ge' => '>=', 'gt' => '>', 'le' => '<=', 'lt' => '<', 'not' => '!=');

        $result = array();

        foreach ($depArray as $depItem) {
            if (empty($depItem['rel']) || !array_key_exists($depItem['rel'], $dep10toOperatorMap)) {
                // 'unknown rel type:' . $depItem['rel'];
                continue;
            }

            $depType = !empty($depItem['optional']) && 'yes' == $depItem['optional']
                ? 'optional'
                : 'required';
            $depType = 'not' == $depItem['rel']
                ? 'conflicts'
                : $depType;

            $depVersion = !empty($depItem['version']) ? $this->parseVersion($depItem['version']) : '*';

            // has & not are special operators that does not requires version
            $depVersionConstraint = ('has' == $depItem['rel'] || 'not' == $depItem['rel']) && '*' == $depVersion
                ? '*'
                : $dep10toOperatorMap[$depItem['rel']] . $depVersion;

            switch ($depItem['type']) {
                case 'php':
                    $depChannelName = 'php';
                    $depPackageName = '';
                    break;
                case 'pkg':
                    $depChannelName = !empty($depItem['channel']) ? $depItem['channel'] : 'pear.php.net';
                    $depPackageName = $depItem['name'];
                    break;
                case 'ext':
                    $depChannelName = 'ext';
                    $depPackageName = $depItem['name'];
                    break;
                case 'os':
                case 'sapi':
                    $depChannelName = '';
                    $depPackageName = '';
                break;
                default:
                    $depChannelName = '';
                    $depPackageName = '';
                    break;
            }

            if ('' != $depChannelName) {
                $result[] = new DependencyConstraint(
                    $depType,
                    $depVersionConstraint,
                    $depChannelName,
                    $depPackageName
                );
            }
        }

        return $result;
    }
Builds dependency information from package.xml 1.0 format

https://pear.php.net/manual/en/guide.developers.package2.dependencies.php

package.xml 1.0 format consists of array of
{ type="php|os|sapi|ext|pkg" rel="has|not|eq|ge|gt|le|lt" optional="yes"
channel="channelName" name="extName|packageName" }

@param array $depArray Dependency data in package.xml 1.0 format
@return DependencyConstraint[]