php code scanner

php_code_scanner.php

<?php

declare(strict_types=1);

use function var_dump as d;

$files = shell_exec("find . -name '*.php' -print0");
$files = explode("\x00", rtrim($files, "\x00"));
foreach ($files as $file) {
    echo "Checking {$file}...";
    if ($file === __FILE__) {
        echo "skipping self\n";
        continue;
    }
    $contents = file_get_contents($file);
    if (false === strpos($contents, 'ucfirst')) {
        echo "skipping, no ucfirst\n";
        continue;
    }
    $phpNeedle = '<?php';
    $phpPos = strpos($contents, $phpNeedle);
    if ($phpPos === false) {
        echo "skipping, no {$phpNeedle}\n";
        continue;
    }
    $skipString = 'use function EasyAdGlobalFunctions\mb_ucfirst as ucfirst;';
    if (false !== strpos($contents, $skipString)) {
        echo "skipping, {$skipString}\n";
        continue;
    }
    $phpPos = $phpPos + strlen($phpNeedle);
    // now to avoid PHP Fatal error:  strict_types declaration must be the very first statement in the script
    if (1) {
        $declareNeedleRex = '/declare\s*\(\s*strict_types\s*\=\s*\d+\s*\)\s*\;/';
        $matches = [];
        if (preg_match($declareNeedleRex, $contents, $matches, PREG_OFFSET_CAPTURE)) {
            $phpPos = $matches[0][1] + strlen($matches[0][0]);
        }
    }
    // now to avoid PHP Fatal error:  Namespace declaration statement has to be the very first statement or after any declare call in the script
    if (1) {
        $namespaceNeedleRex = '/^\s*namespace\s+[\w\\\\]+\s*\;/m';
        $matches = [];
        if (preg_match($namespaceNeedleRex, $contents, $matches, PREG_OFFSET_CAPTURE)) {
            $phpPos = $matches[0][1] + strlen($matches[0][0]);
        }
    }
    $insertString = "\nuse function EasyAdGlobalFunctions\mb_ucfirst as ucfirst;";
    $pre = substr($contents, 0, $phpPos);
    $post = substr($contents, $phpPos);
    if (0 === strpos($post, ' extract')) {
        $insertString = $insertString . "\n";
    }
    $contents = $pre . $insertString . $post;
    file_put_contents($file, $contents, LOCK_EX);
}