strrpos - PHP code example

PHP Function Strpos - Find the Index of the Last Occurrence of a String in Another String

There are times when you need to find out the position of a substring within another string. The php function strrpos is an in-built string manipulation function that helps you perform such tasks. It can be used for various applications such as parsing text, validating input data and extracting specific content from strings. The function offers flexibility with its optional offset parameter and case sensitivity options.

strrpos() is an in-built function that helps you find the index of the last occurrence of a particular string in another string. It accepts two input parameters, $string and the search string. You can also pass an optional third argument to start the search from a certain position in the string. The returned value is the number of the position where the searched string was found.

Like the strstr() function, strpos() is case sensitive. It will not match 'hello' with 'Hello'. To get around this, you need to use its case-insensitive equivalent, stripos(), or the str_contains() function.

The stripos() function is similar to strpos() but it ignores the case of the characters. It can be useful when you want to search for a particular string but don't care about matching its case. The input parameters are the same as those of strpos(), except for an optional $offset parameter which starts searching from this position instead of 0. The search will still be case sensitive, but it will not treat COME and come the same way.

strrpos example

$allCommands = $this->commandLoader ? array_merge($this->commandLoader->getNames(), array_keys($this->commands)) : array_keys($this->commands);
        $expr = implode('[^:]*:', array_map('preg_quote', explode(':', $name))).'[^:]*';
        $commands = preg_grep('{^'.$expr.'}', $allCommands);

        if (empty($commands)) {
            $commands = preg_grep('{^'.$expr.'}i', $allCommands);
        }

        // if no commands matched or we just matched namespaces         if (empty($commands) || \count(preg_grep('{^'.$expr.'$}i', $commands)) < 1) {
            if (false !== $pos = strrpos($name, ':')) {
                // check if a namespace exists and contains commands                 $this->findNamespace(substr($name, 0, $pos));
            }

            $message = sprintf('Command "%s" is not defined.', $name);

            if ($alternatives = $this->findAlternatives($name, $allCommands)) {
                // remove hidden commands                 $alternatives = array_filter($alternatives, fn ($name) => !$this->get($name)->isHidden());

                if (1 == \count($alternatives)) {

break;
                    }
                }
                break;
            }
        }

        $name = str_replace('\\', '/', (string) $file);

        return [
            'name' => substr($name, strrpos($name, '/') + 1),
            'file' => $file,
            'line' => $line,
        ];
    }
}

->addViolation();
        }
    }

    private function isValid(string $domain): bool
    {
        return false !== filter_var($domain, \FILTER_VALIDATE_DOMAIN, \FILTER_FLAG_HOSTNAME);
    }

    private function hasValidTld(string $domain): bool
    {
        return str_contains($domain, '.') && !\in_array(substr($domain, strrpos($domain, '.') + 1), self::RESERVED_TLDS, true);
    }
}

'force' => null,
            'php' => \PHP_MAJOR_VERSION.'.'.\PHP_MINOR_VERSION,
            'deprecations' => true,
        ];

        if ('phpdoc' === $this->patchTypes['force']) {
            $this->patchTypes['force'] = 'docblock';
        }

        if (!isset(self::$caseCheck)) {
            $file = is_file(__FILE__) ? __FILE__ : rtrim(realpath('.'), \DIRECTORY_SEPARATOR);
            $i = strrpos($file, \DIRECTORY_SEPARATOR);
            $dir = substr($file, 0, 1 + $i);
            $file = substr($file, 1 + $i);
            $test = strtoupper($file) === $file ? strtolower($file) : strtoupper($file);
            $test = realpath($dir.$test);

            if (false === $test || false === $i) {
                // filesystem is case sensitive                 self::$caseCheck = 0;
            } elseif (str_ends_with($test, $file)) {
                // filesystem is case insensitive and realpath() normalizes the case of characters                 self::$caseCheck = 1;
            }

throw new \InvalidArgumentException(sprintf('Invalid definition for service of class "%s": the "interface" attribute is missing on a "proxy" tag.', $definition->getClass()));
            }
            if (!interface_exists($tag['interface'])) {
                throw new \InvalidArgumentException(sprintf('Invalid definition for service of class "%s": several "proxy" tags found but "%s" is not an interface.', $definition->getClass(), $tag['interface']));
            }

            $proxyInterface .= '\\'.$tag['interface'];
            $interfaces .= ', \\'.$tag['interface'];
        }

        if (!interface_exists($proxyInterface)) {
            $i = strrpos($proxyInterface, '\\');
            $namespace = substr($proxyInterface, 0, $i);
            $interface = substr($proxyInterface, 1 + $i);
            $interfaces = substr($interfaces, 2);

            eval("namespace {$namespace}; interface {$interface} extends {$interfaces} {}");
        }

        return $proxyInterface;
    }
}

public function needsRehash(string $hashedPassword): bool
    {
        return false;
    }

    private function mergePasswordAndSalt(#[\SensitiveParameter] string $password, ?string $salt): string     {
        if (empty($salt)) {
            return $password;
        }

        if (false !== strrpos($salt, '{') || false !== strrpos($salt, '}')) {
            throw new \InvalidArgumentException('Cannot use { or } in salt.');
        }

        return $password.'{'.$salt.'}';
    }
}

$s = ReflectionCaster::getSignature($s);

                if (str_ends_with($identifier, '()')) {
                    $this->value = substr_replace($identifier, $s, -2);
                } else {
                    $this->value .= $s;
                }
            }
        } catch (\ReflectionException) {
            return;
        } finally {
            if (0 < $i = strrpos($this->value, '\\')) {
                $this->attr['ellipsis'] = \strlen($this->value) - $i;
                $this->attr['ellipsis-type'] = 'class';
                $this->attr['ellipsis-tail'] = 1;
            }
        }

        if ($f = $r->getFileName()) {
            $this->attr['file'] = $f;
            $this->attr['line'] = $r->getStartLine();
        }
    }

<div class="trace trace-as-html" id="trace-box-<?= $index; ?>"> <div class="trace-details"> <div class="trace-head"> <div class="sf-toggle" data-toggle-selector="#trace-html-<?= $index; ?>" data-toggle-initial="<?= $expand ? 'display' : ''; ?>"> <span class="icon icon-close"><?= $this->include('assets/images/icon-minus-square-o.svg'); ?></span> <span class="icon icon-open"><?= $this->include('assets/images/icon-plus-square-o.svg'); ?></span> <?php                 $separator = strrpos($exception['class'], '\\');
                $separator = false === $separator ? 0 : $separator + 1;

                $namespace = substr($exception['class'], 0, $separator);
                $class = substr($exception['class'], $separator);
                ?> <?php if ('' === $class) { ?> <br> <?php } else { ?> <h3 class="trace-class"> <?php if ('' !== $namespace) { ?> <span class="trace-namespace"><?= $namespace; ?></span>

public function getPort(): int|string|null
    {
        if ($this->isFromTrustedProxy() && $host = $this->getTrustedValues(self::HEADER_X_FORWARDED_PORT)) {
            $host = $host[0];
        } elseif ($this->isFromTrustedProxy() && $host = $this->getTrustedValues(self::HEADER_X_FORWARDED_HOST)) {
            $host = $host[0];
        } elseif (!$host = $this->headers->get('HOST')) {
            return $this->server->get('SERVER_PORT');
        }

        if ('[' === $host[0]) {
            $pos = strpos($host, ':', strrpos($host, ']'));
        } else {
            $pos = strrpos($host, ':');
        }

        if (false !== $pos && $port = substr($host, $pos + 1)) {
            return (int) $port;
        }

        return 'https' === $this->getScheme() ? 443 : 80;
    }

$r = ('#' !== $v[0] ? 1 - ('@' !== $v[0]) : 2).substr($value, 1);

            return sprintf('<a class=sf-dump-ref href=#%s-ref%s title="%d occurrences">%s</a>', $this->dumpId, $r, 1 + $attr['count'], $v);
        }

        if ('const' === $style && isset($attr['value'])) {
            $style .= sprintf(' title="%s"', esc(\is_scalar($attr['value']) ? $attr['value'] : json_encode($attr['value'])));
        } elseif ('public' === $style) {
            $style .= sprintf(' title="%s"', empty($attr['dynamic']) ? 'Public property' : 'Runtime added dynamic property');
        } elseif ('str' === $style && 1 < $attr['length']) {
            $style .= sprintf(' title="%d%s characters"', $attr['length'], $attr['binary'] ? ' binary or non-UTF-8' : '');
        } elseif ('note' === $style && 0 < ($attr['depth'] ?? 0) && false !== $c = strrpos($value, '\\')) {
            $style .= ' title=""';
            $attr += [
                'ellipsis' => \strlen($value) - $c,
                'ellipsis-type' => 'note',
                'ellipsis-tail' => 1,
            ];
        } elseif ('protected' === $style) {
            $style .= ' title="Protected property"';
        } elseif ('meta' === $style && isset($attr['title'])) {
            $style .= sprintf(' title="%s"', esc($this->utf8Encode($attr['title'])));
        } elseif ('private' === $style) {

        $this->dnsGetRecord = $dnsGetRecord;
    }

    public function isValid(string $email, EmailLexer $emailLexer): bool
    {
        // use the input to check DNS if we cannot extract something similar to a domain         $host = $email;

        // Arguable pattern to extract the domain. Not aiming to validate the domain nor the email         if (false !== $lastAtPos = strrpos($email, '@')) {
            $host = substr($email, $lastAtPos + 1);
        }

        // Get the domain parts         $hostParts = explode('.', $host);

        $isLocalDomain = count($hostParts) <= 1;
        $isReservedTopLevel = in_array($hostParts[(count($hostParts) - 1)], self::RESERVED_DNS_TOP_LEVEL_NAMES, true);

        // Exclude reserved top level DNS names         if ($isLocalDomain || $isReservedTopLevel) {

return 0;
    }

    /** * Set content type by guessing mime type from file extension */
    private function setContentTypeByMimeType(): void
    {
        $mime    = null;
        $charset = '';

        if ($this->setMime === true && ($lastDotPosition = strrpos($this->filename, '.')) !== false) {
            $mime    = Mimes::guessTypeFromExtension(substr($this->filename, $lastDotPosition + 1));
            $charset = $this->charset;
        }

        if (! is_string($mime)) {
            // Set the default MIME type to send             $mime    = 'application/octet-stream';
            $charset = '';
        }

        $this->setContentType($mime, $charset);
    }

$target->scheme = $base->scheme;
                $target->iuserinfo = $base->iuserinfo;
                $target->ihost = $base->ihost;
                $target->port = $base->port;
                if ($relative->ipath !== '') {
                    if ($relative->ipath[0] === '/') {
                        $target->ipath = $relative->ipath;
                    }
                    elseif (($base->iuserinfo !== null || $base->ihost !== null || $base->port !== null) && $base->ipath === '') {
                        $target->ipath = '/' . $relative->ipath;
                    }
                    elseif (($last_segment = strrpos($base->ipath, '/')) !== false) {
                        $target->ipath = substr($base->ipath, 0, $last_segment + 1) . $relative->ipath;
                    }
                    else {
                        $target->ipath = $relative->ipath;
                    }
                    $target->ipath = $target->remove_dot_segments($target->ipath);
                    $target->iquery = $relative->iquery;
                }
                else {
                    $target->ipath = $base->ipath;
                    if ($relative->iquery !== null) {

        $type = $reference->getType();

        $i = null;
        $namespace = $type;
        do {
            $namespace = substr($namespace, 0, $i);

            if ($this->container->hasDefinition($namespace) && $tag = $this->container->getDefinition($namespace)->getTag('container.excluded')) {
                return sprintf('Cannot autowire service "%s": %s needs an instance of "%s" but this type has been excluded %s.', $currentId, $label, $type, $tag[0]['source'] ?? 'from autowiring');
            }
        } while (false !== $i = strrpos($namespace, '\\'));

        if (!$r = $this->container->getReflectionClass($type, false)) {
            // either $type does not exist or a parent class does not exist             try {
                if (class_exists(ClassExistenceResource::class)) {
                    $resource = new ClassExistenceResource($type, false);
                    // isFresh() will explode ONLY if a parent class/trait does not exist                     $resource->isFresh(0);
                    $parentMsg = false;
                } else {
                    $parentMsg = "couldn't be loaded. Either it was not found or it is missing a parent class or a trait";
                }