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PHP Tutorial

PHP HOMEPHP IntroPHP InstallPHP SyntaxPHP CommentsPHP VariablesPHP Echo / PrintPHP Data TypesPHP StringsPHP NumbersPHP CastingPHP MathPHP ConstantsPHP Magic ConstantsPHP OperatorsPHP If...Else...ElseifPHP SwitchPHP MatchPHP LoopsPHP FunctionsPHP ArraysPHP SuperglobalsPHP RegExPHP RegEx Functions

PHP Forms

PHP Form HandlingPHP Form ValidationPHP Form RequiredPHP Form URL/E-mailPHP Form Complete

PHP Advanced

PHP Date and TimePHP IncludePHP File HandlingPHP File Open/ReadPHP File Create/WritePHP File UploadPHP CookiesPHP SessionsPHP FiltersPHP Filters AdvancedPHP Callback FunctionsPHP JSONPHP Exceptions

PHP OOP

PHP What is OOPPHP Classes/ObjectsPHP ConstructorPHP DestructorPHP Access ModifiersPHP InheritancePHP ConstantsPHP Abstract ClassesPHP InterfacesPHP TraitsPHP Static MethodsPHP Static PropertiesPHP NamespacesPHP Iterables

MySQL Database

MySQL DatabaseMySQL ConnectMySQL Create DBMySQL Create TableMySQL Insert DataMySQL Get Last IDMySQL Insert MultipleMySQL PreparedMySQL Select DataMySQL WhereMySQL Order ByMySQL Delete DataMySQL Update DataMySQL Limit Data

PHP XML

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PHP - AJAX

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PHP Examples

PHP ExamplesPHP CompilerPHP QuizPHP ExercisesPHP ServerPHP SyllabusPHP Study PlanPHP Certificate

PHP Reference

PHP OverviewPHP Array
array()array_change_key_case()array_chunk()array_column()array_combine()array_count_values()array_diff()array_diff_assoc()array_diff_key()array_diff_uassoc()array_diff_ukey()array_fill()array_fill_keys()array_filter()array_flip()array_intersect()array_intersect_assoc()array_intersect_key()array_intersect_uassoc()array_intersect_ukey()array_key_exists()array_keys()array_map()array_merge()array_merge_recursive()array_multisort()array_pad()array_pop()array_product()array_push()array_rand()array_reduce()array_replace()array_replace_recursive()array_reverse()array_search()array_shift()array_slice()array_splice()array_sum()array_udiff()array_udiff_assoc()array_udiff_uassoc()array_uintersect()array_uintersect_assoc()array_uintersect_uassoc()array_unique()array_unshift()array_values()array_walk()array_walk_recursive()arsort()asort()compact()count()current()each()end()extract()in_array()key()krsort()ksort()list()natcasesort()natsort()next()pos()prev()range()reset()rsort()shuffle()sizeof()sort()uasort()uksort()usort()
PHP CalendarPHP Date
checkdate()date_add()date_create_from_format()date_create()date_date_set()date_default_timezone_get()date_default_timezone_set()date_diff()date_format()date_get_last_errors()date_interval_create_from_date_string()date_interval_format()date_isodate_set()date_modify()date_offset_get()date_parse_from_format()date_parse()date_sub()date_sun_info()date_sunrise()date_sunset()date_time_set()date_timestamp_get()date_timestamp_set()date_timezone_get()date_timezone_set()date()getdate()gettimeofday()gmdate()gmmktime()gmstrftime()idate()localtime()microtime()mktime()strftime()strptime()strtotime()time()timezone_abbreviations_list()timezone_identifiers_list()timezone_location_get()timezone_name_from_abbr()timezone_name_get()timezone_offset_get()timezone_open()timezone_transitions_get()timezone_version_get()
PHP DirectoryPHP ErrorPHP ExceptionPHP Filesystem
basename()chgrp()chmod()chown()clearstatcache()copy()delete()dirname()disk_free_space()disk_total_space()diskfreespace()fclose()feof()fflush()fgetc()fgetcsv()fgets()fgetss()file()file_exists()file_get_contents()file_put_contents()fileatime()filectime()filegroup()fileinode()filemtime()fileowner()fileperms()filesize()filetype()flock()fnmatch()fopen()fpassthru()fputcsv()fputs()fread()fscanf()fseek()fstat()ftell()ftruncate()fwrite()glob()is_dir()is_executable()is_file()is_link()is_readable()is_uploaded_file()is_writable()is_writeable()lchgrp()lchown()link()linkinfo()lstat()mkdir()move_uploaded_file()parse_ini_file()parse_ini_string()pathinfo()pclose()popen()readfile()readlink()realpath()realpath_cache_get()realpath_cache_size()rename()rewind()rmdir()set_file_buffer()stat()symlink()tempnam()tmpfile()touch()umask()unlink()
PHP FilterPHP FTPPHP JSONPHP KeywordsPHP LibxmlPHP MailPHP MathPHP MiscPHP MySQLiPHP NetworkPHP Output ControlPHP RegExPHP SimpleXMLPHP StreamPHP String
addcslashes()addslashes()bin2hex()chop()chr()chunk_split()convert_cyr_string()convert_uudecode()convert_uuencode()count_chars()crc32()crypt()echo()explode()fprint()get_html_translation_table()hebrev()hebrevc()hex2bin()html_entity_decode()htmlentities()htmlspecialchars_decode()htmlspecialchars()implode()join()lcfirst()levenshtein()localeconv()ltrim()md5()md5_file()metaphone()money_format()nl_langinfo()nl2br()number_format()ord()parse_str()print()printf()quoted_printable_decode()quoted_printable_encode()quotemeta()rtrim()setlocale()sha1()sha1_file()similar_text()soundex()sprintf()sscanf()str_contains()str_ends_with()str_getcsv()str_ireplace()str_pad()str_repeat()str_replace()str_rot13()str_shuffle()str_split()str_starts_with()str_word_count()strcasecmp()strchr()strcmp()strcoll()strcspn()strip_tags()stripcslashes()stripslashes()stripos()stristr()strlen()strnatcasecmp()strnatcmp()strncasecmp()strncmp()strpbrk()strpos()strrchr()strrev()strripos()strrpos()strspn()strstr()strtok()strtolower()strtoupper()strtr()substr()substr_compare()substr_count()substr_replace()trim()ucfirst()ucwords()vfprintf()vprintf()vsprintf()wordwrap()
PHP Variable HandlingPHP XML ParserPHP ZipPHP Timezones

W3SchoolsPHP Certificate Certificate


w3schoolsCERTIFIED.2025  

W3Schools offers an Online Certification Program.

The perfect solution for busy professionals who need to balance work, family, and career building.

More than 50 000 certificates already issued!


Get Your Certificate »

w3schoolsCERTIFIED.2025

W3Schools offers an Online Certification Program.

The perfect solution for busy professionals who need to balance work, family, and career building.

More than 50 000 certificates already issued!

Get Your Certificate »

Document your skills
Improve your career
Study at your own pace
Save time and money
Known brand
Trusted by top companies

Who Should Consider Getting Certified?

Any student or professional within the digital industry.

Certifications are valuable assets to gain trust and demonstrate knowledge to your clients, current or future employers on a ever increasing competitive market.

W3Schools is Trusted by Top Companies

W3Schools has over two decades of experience with teaching coding online.

Our certificates are recognized and valued by companies looking to employ skilled developers.

Save Time and Money

Show the world your coding skills by getting a certification.

The prices is a small fraction compared to the price of traditional education.

Document and validate your competence by getting certified!

Exam overview

Fee: 95 USD

Achievable certification levels:
Intermediate (40%)
Advanced (75%)
Professional (90%)

Number of questions:
Adaptive,60 on average

Requirement to pass:
Minimum 40% - Intermediate level

Time limit: 60 minutes

Number of attempts to pass: 3

Exam deadline: None

Certification Expiration: None

Format: Online, multiple choice

Register now »


Advance Faster in Your Career

Getting a certificate proves your commitment to upgrading your skills.

The certificate can be added as credentials to your CV, Resume, LinkedIn profile, and so on.

It gives you the credibility needed for more responsibilities, larger projects, and a higher salary.

Knowledge is power, especially in the current job market.

Documentation of your skills enables you to advance your career or helps you to start a new one.


How Does It Work?

  • Study for free at W3Schools.com
  • Study at your own speed
  • Test your skills with W3Schools online quizzes
  • Apply for your certificate by paying an exam fee
  • Take your exam online, at any time, and from any location

Get Your Certificate and Share It With The World

Example certificate:

PHP Certificate

Each certificate gets a unique link that can be shared with others.

Validate your certification with the link or QR code.

Check how it looks like in thisExample.

Share your certificate on Linked in the Certifications section in just one click!


Document Your Skills

Getting a certificate proves your commitment to upgrade your skills,gives you the credibility needed for more responsibilities, larger projects, and a higher salary.

Get Your Certificate »


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