FunctionDetector.php

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<?php
namespace Magento\TestFramework\Utility;

class FunctionDetector
{
    public function detect($filePath, $functions)
    {
        $result = [];
        $regexp = $this->composeRegexp($functions);

        if (!$regexp) {
            return $result;
        }

        $fileContent = \Magento\TestFramework\Utility\ChangedFiles::getChangedContent($filePath);
        $file = file($filePath);

        return $fileContent
            ? $this->grepChangedContent($file, $regexp, $functions, $fileContent)
            : $this->grepFile($file, $regexp);
    }

    public function grepChangedContent(array $file, $regexp, $functions, $fileContent)
    {
        $result = [];
        $matches = preg_grep($regexp, explode("\n", $fileContent));
        if (!empty($matches)) {
            foreach ($matches as $line) {
                $actualFunctions = [];
                foreach ($functions as $function) {
                    if (false !== strpos($line, $function)) {
                        $actualFunctions[] = $function;
                    }
                }
                $result[array_search($line . "\n", $file) + 1] = $actualFunctions;
            }
        }

        return $result;
    }

    public function grepFile(array $file, $regexp)
    {
        $result = [];
        array_unshift($file, '');
        $lines = preg_grep($regexp, $file);
        foreach ($lines as $lineNumber => $line) {
            if (preg_match_all($regexp, $line, $matches)) {
                $result[$lineNumber] = $matches[1];
            }
        }

        return $result;
    }

    private function composeRegexp(array $functions)
    {
        if (empty($functions)) {
            return '';
        }
        return '/(?<!function |->|::)\b(' . join('|', $functions) . ')\s*\(/i';
    }
}