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File Name : LowercasePHPFunctionsSniff.php

<?php
/**
 * Ensures all calls to inbuilt PHP functions are lowercase.
 *
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Standards\Squiz\Sniffs\PHP;

use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Sniffs\Sniff;
use PHP_CodeSniffer\Util\Tokens;

class LowercasePHPFunctionsSniff implements Sniff
{

/**
     * Hash map of all php built in function names
     *
     * @var array<string, int>
     */
    private $builtInFunctions;

/**
     * Construct the LowercasePHPFunctionSniff
     */
    public function __construct()
    {

$allFunctions           = get_defined_functions();
        $this->builtInFunctions = array_flip($allFunctions['internal']);

}//end __construct()

/**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register()
    {
        return [T_STRING];

}//end register()

/**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the current token in
     *                                               the stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();

$content   = $tokens[$stackPtr]['content'];
        $contentLc = strtolower($content);
        if ($content === $contentLc) {
            return;
        }

// Make sure it is an inbuilt PHP function.
        // PHP_CodeSniffer can possibly include user defined functions
        // through the use of vendor/autoload.php.
        if (isset($this->builtInFunctions[$contentLc]) === false) {
            return;
        }

// Make sure this is a function call or a use statement.
        if (empty($tokens[$stackPtr]['nested_attributes']) === false) {
            // Class instantiation in attribute, not function call.
            return;
        }

$next = $phpcsFile->findNext(Tokens::$emptyTokens, ($stackPtr + 1), null, true);
        if ($next === false) {
            // Not a function call.
            return;
        }

$ignore   = Tokens::$emptyTokens;
        $ignore[] = T_BITWISE_AND;
        $prev     = $phpcsFile->findPrevious($ignore, ($stackPtr - 1), null, true);
        $prevPrev = $phpcsFile->findPrevious(Tokens::$emptyTokens, ($prev - 1), null, true);

if ($tokens[$next]['code'] !== T_OPEN_PARENTHESIS) {
            // Is this a use statement importing a PHP native function ?
            if ($tokens[$next]['code'] !== T_NS_SEPARATOR
                && $tokens[$prev]['code'] === T_STRING
                && $tokens[$prev]['content'] === 'function'
                && $prevPrev !== false
                && $tokens[$prevPrev]['code'] === T_USE
            ) {
                $error = 'Use statements for PHP native functions must be lowercase; expected "%s" but found "%s"';
                $data  = [
                    $contentLc,
                    $content,
                ];

$fix = $phpcsFile->addFixableError($error, $stackPtr, 'UseStatementUppercase', $data);
                if ($fix === true) {
                    $phpcsFile->fixer->replaceToken($stackPtr, $contentLc);
                }
            }

// No open parenthesis; not a "use function" statement nor a function call.
            return;
        }//end if

if ($tokens[$prev]['code'] === T_FUNCTION) {
            // Function declaration, not a function call.
            return;
        }

if ($tokens[$prev]['code'] === T_NS_SEPARATOR) {
            if ($prevPrev !== false
                && ($tokens[$prevPrev]['code'] === T_STRING
                || $tokens[$prevPrev]['code'] === T_NAMESPACE
                || $tokens[$prevPrev]['code'] === T_NEW)
            ) {
                // Namespaced class/function, not an inbuilt function.
                // Could potentially give false negatives for non-namespaced files
                // when namespace\functionName() is encountered.
                return;
            }
        }

if ($tokens[$prev]['code'] === T_NEW) {
            // Object creation, not an inbuilt function.
            return;
        }

if ($tokens[$prev]['code'] === T_OBJECT_OPERATOR
            || $tokens[$prev]['code'] === T_NULLSAFE_OBJECT_OPERATOR
        ) {
            // Not an inbuilt function.
            return;
        }

if ($tokens[$prev]['code'] === T_DOUBLE_COLON) {
            // Not an inbuilt function.
            return;
        }

$error = 'Calls to PHP native functions must be lowercase; expected "%s" but found "%s"';
        $data  = [
            $contentLc,
            $content,
        ];

$fix = $phpcsFile->addFixableError($error, $stackPtr, 'CallUppercase', $data);
        if ($fix === true) {
            $phpcsFile->fixer->replaceToken($stackPtr, $contentLc);
        }

}//end process()

}//end class

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-11-04 04:30:35
..	dir	-	root/root	0755	2025-11-04 04:30:35
CommentedOutCodeSniff.php	text/x-php	9.26 KB	root/root	0644	2025-11-04 04:30:35
DisallowBooleanStatementSniff.php	text/x-php	1.74 KB	root/root	0644	2025-11-04 04:30:35
DisallowComparisonAssignmentSniff.php	text/x-php	3.51 KB	root/root	0644	2025-11-04 04:30:35
DisallowInlineIfSniff.php	text/x-php	1.34 KB	root/root	0644	2025-11-04 04:30:35
DisallowMultipleAssignmentsSniff.php	text/x-php	6.99 KB	root/root	0644	2025-11-04 04:30:35
DisallowSizeFunctionsInLoopsSniff.php	text/x-php	3.57 KB	root/root	0644	2025-11-04 04:30:35
DiscouragedFunctionsSniff.php	text/x-php	1013 B	root/root	0644	2025-11-04 04:30:35
EmbeddedPhpSniff.php	text/x-php	22.87 KB	root/root	0644	2025-11-04 04:30:35
EvalSniff.php	text/x-php	1.18 KB	root/root	0644	2025-11-04 04:30:35
GlobalKeywordSniff.php	text/x-php	1.45 KB	root/root	0644	2025-11-04 04:30:35
HeredocSniff.php	text/x-php	1.31 KB	root/root	0644	2025-11-04 04:30:35
InnerFunctionsSniff.php	text/x-php	2.08 KB	root/root	0644	2025-11-04 04:30:35
LowercasePHPFunctionsSniff.php	text/x-php	5.17 KB	root/root	0644	2025-11-04 04:30:35
NonExecutableCodeSniff.php	text/x-php	11.59 KB	root/root	0644	2025-11-04 04:30:35

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