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run code in 300+ PHP versions simultaneously
<?php $str = '{ "config": { "cache-files-ttl": 0, "discard-changes": true }, "minimum-stability": "stable", "prefer-stable": false, "provide": { "heroku-sys/cedar": "14.2016.03.22" }, "repositories": [ { "packagist.org": false }, { "type": "package", "package": [ { "type": "metapackage", "name": "anthonymartin/geo-location", "version": "v1.0.0", "require": { "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "aws/aws-sdk-php", "version": "3.9.4", "require": { "heroku-sys/php": ">=5.5" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "cloudinary/cloudinary_php", "version": "dev-master", "require": { "heroku-sys/ext-curl": "*", "heroku-sys/ext-json": "*", "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "doctrine/annotations", "version": "v1.2.7", "require": { "heroku-sys/php": ">=5.3.2" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "doctrine/cache", "version": "v1.6.0", "require": { "heroku-sys/php": "~5.5|~7.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "doctrine/collections", "version": "v1.3.0", "require": { "heroku-sys/php": ">=5.3.2" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "doctrine/common", "version": "v2.6.1", "require": { "heroku-sys/php": "~5.5|~7.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "doctrine/inflector", "version": "v1.1.0", "require": { "heroku-sys/php": ">=5.3.2" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "doctrine/lexer", "version": "v1.0.1", "require": { "heroku-sys/php": ">=5.3.2" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "geoip/geoip", "version": "v1.16", "require": [], "replace": [], "provide": [], "conflict": { "heroku-sys/ext-geoip": "*" } }, { "type": "metapackage", "name": "giggsey/libphonenumber-for-php", "version": "7.2.5", "require": { "heroku-sys/ext-mbstring": "*" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "guzzlehttp/guzzle", "version": "5.3.0", "require": { "heroku-sys/php": ">=5.4.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "guzzlehttp/promises", "version": "1.0.3", "require": { "heroku-sys/php": ">=5.5.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "guzzlehttp/psr7", "version": "1.2.3", "require": { "heroku-sys/php": ">=5.4.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "guzzlehttp/ringphp", "version": "1.1.0", "require": { "heroku-sys/php": ">=5.4.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "guzzlehttp/streams", "version": "3.0.0", "require": { "heroku-sys/php": ">=5.4.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "hipchat/hipchat-php", "version": "v1.4", "require": { "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "kriswallsmith/buzz", "version": "v0.15", "require": { "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "league/csv", "version": "8.0.0", "require": { "heroku-sys/ext-mbstring": "*", "heroku-sys/php": ">=5.5.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "league/fractal", "version": "0.13.0", "require": { "heroku-sys/php": ">=5.4" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "mashape/unirest-php", "version": "1.2.1", "require": { "heroku-sys/ext-curl": "*", "heroku-sys/ext-json": "*", "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "mtdowling/jmespath.php", "version": "2.3.0", "require": { "heroku-sys/php": ">=5.4.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "palex/phpstructureddata", "version": "v2.0.1", "require": { "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "psr/http-message", "version": "1.0", "require": { "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "react/promise", "version": "v2.2.1", "require": { "heroku-sys/php": ">=5.4.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "rollbar/rollbar", "version": "v0.15.0", "require": { "heroku-sys/ext-curl": "*" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "ronanguilloux/isocodes", "version": "1.2.0", "require": { "heroku-sys/ext-bcmath": "*", "heroku-sys/php": ">=5.4.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "sendgrid/sendgrid", "version": "2.1.1", "require": { "heroku-sys/php": ">=5.3" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "sendgrid/smtpapi", "version": "0.0.1", "require": { "heroku-sys/php": ">=5.3" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "symfony/css-selector", "version": "v2.8.2", "require": { "heroku-sys/php": ">=5.3.9" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "symfony/http-foundation", "version": "v2.8.2", "require": { "heroku-sys/php": ">=5.3.9" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "symfony/polyfill-php54", "version": "v1.1.0", "require": { "heroku-sys/php": ">=5.3.3" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "symfony/polyfill-php55", "version": "v1.1.0", "require": { "heroku-sys/php": ">=5.3.3" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "thepixeldeveloper/sitemap", "version": "3.0.0", "require": { "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "tijsverkoyen/css-to-inline-styles", "version": "1.5.5", "require": { "heroku-sys/php": ">=5.3.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "yiisoft/yii", "version": "1.1.17", "require": { "heroku-sys/php": ">=5.1.0" }, "replace": [], "provide": [], "conflict": [] }, { "type": "metapackage", "name": "composer.json/composer.lock", "version": "dev-597511d6d51b96e4a8afeba2c79982e5", "require": { "heroku-sys/php": "~5.6.0", "heroku-sys/ext-newrelic": "*", "heroku-sys/ext-gd": "*", "heroku-sys/ext-redis": "*" }, "replace": [], "provide": [], "conflict": [] } ] } ], "require": { "composer.json/composer.lock": "dev-597511d6d51b96e4a8afeba2c79982e5", "anthonymartin/geo-location": "v1.0.0", "aws/aws-sdk-php": "3.9.4", "cloudinary/cloudinary_php": "dev-master", "doctrine/annotations": "v1.2.7", "doctrine/cache": "v1.6.0", "doctrine/collections": "v1.3.0", "doctrine/common": "v2.6.1", "doctrine/inflector": "v1.1.0", "doctrine/lexer": "v1.0.1", "geoip/geoip": "v1.16", "giggsey/libphonenumber-for-php": "7.2.5", "guzzlehttp/guzzle": "5.3.0", "guzzlehttp/promises": "1.0.3", "guzzlehttp/psr7": "1.2.3", "guzzlehttp/ringphp": "1.1.0", "guzzlehttp/streams": "3.0.0", "hipchat/hipchat-php": "v1.4", "kriswallsmith/buzz": "v0.15", "league/csv": "8.0.0", "league/fractal": "0.13.0", "mashape/unirest-php": "1.2.1", "mtdowling/jmespath.php": "2.3.0", "palex/phpstructureddata": "v2.0.1", "psr/http-message": "1.0", "react/promise": "v2.2.1", "rollbar/rollbar": "v0.15.0", "ronanguilloux/isocodes": "1.2.0", "sendgrid/sendgrid": "2.1.1", "sendgrid/smtpapi": "0.0.1", "symfony/css-selector": "v2.8.2", "symfony/http-foundation": "v2.8.2", "symfony/polyfill-php54": "v1.1.0", "symfony/polyfill-php55": "v1.1.0", "thepixeldeveloper/sitemap": "3.0.0", "tijsverkoyen/css-to-inline-styles": "1.5.5", "yiisoft/yii": "1.1.17", "heroku-sys/apache": "^2.4.10", "heroku-sys/nginx": "~1.8.0" } }'; $res = preg_match('{(?(DEFINE) (?<number> -? (?= [1-9]|0(?!\d) ) \d+ (\.\d+)? ([eE] [+-]? \d+)? ) (?<boolean> true | false | null ) (?<string> " ([^"\\\\]* | \\\\ ["\\\\bfnrt\/] | \\\\ u [0-9a-f]{4} )* " ) (?<array> \[ (?: (?&json) \s* (?: , (?&json) \s* )* )? \s* \] ) (?<pair> \s* (?&string) \s* : (?&json) \s* ) (?<object> \{ (?: (?&pair) (?: , (?&pair) )* )? \s* \} ) (?<json> \s* (?: (?&number) | (?&boolean) | (?&string) | (?&array) | (?&object) ) ) ) ^(?P<start>\s*\{\s*(?:(?&string)\s*:\s*(?&json)\s*,\s*)*?) (?P<property>'.preg_quote('"require"').'\s*:\s*)(?P<value>(?&json))(?P<end>.*)}sx', $str, $match); var_dump($res, $match['value'] ?? null, preg_last_error() == PREG_JIT_STACKLIMIT_ERROR);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/EUu5k
function name:  (null)
number of ops:  24
compiled vars:  !0 = $str, !1 = $res, !2 = $match
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 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3A+%5B%5D%2C%0A++++++++++++++++++++%22provide%22%3A+%5B%5D%2C%0A++++++++++++++++++++%22conflict%22%3A+%5B%5D%0A++++++++++++++++%7D%0A++++++++++++%5D%0A++++++++%7D%0A++++%5D%2C%0A++++%22require%22%3A+%7B%0A++++++++%22composer.json%2Fcomposer.lock%22%3A+%22dev-597511d6d51b96e4a8afeba2c79982e5%22%2C%0A++++++++%22anthonymartin%2Fgeo-location%22%3A+%22v1.0.0%22%2C%0A++++++++%22aws%2Faws-sdk-php%22%3A+%223.9.4%22%2C%0A++++++++%22cloudinary%2Fcloudinary_php%22%3A+%22dev-master%22%2C%0A++++++++%22doctrine%2Fannotations%22%3A+%22v1.2.7%22%2C%0A++++++++%22doctrine%2Fcache%22%3A+%22v1.6.0%22%2C%0A++++++++%22doctrine%2Fcollections%22%3A+%22v1.3.0%22%2C%0A++++++++%22doctrine%2Fcommon%22%3A+%22v2.6.1%22%2C%0A++++++++%22doctrine%2Finflector%22%3A+%22v1.1.0%22%2C%0A++++++++%22doctrine%2Flexer%22%3A+%22v1.0.1%22%2C%0A++++++++%22geoip%2Fgeoip%22%3A+%22v1.16%22%2C%0A++++++++%22giggsey%2Flibphonenumber-for-php%22%3A+%227.2.5%22%2C%0A++++++++%22guzzlehttp%2Fguzzle%22%3A+%225.3.0%22%2C%0A++++++++%22guzzlehttp%2Fpromises%22%3A+%221.0.3%22%2C%0A++++++++%22guzzlehttp%2Fpsr7%22%3A+%221.2.3%22%2C%0A++++++++%22guzzlehttp%2Fringphp%22%3A+%221.1.0%22%2C%0A++++++++%22guzzlehttp%2Fstreams%22%3A+%223.0.0%22%2C%0A++++++++%22hipchat%2Fhipchat-php%22%3A+%22v1.4%22%2C%0A++++++++%22kriswallsmith%2Fbuzz%22%3A+%22v0.15%22%2C%0A++++++++%22league%2Fcsv%22%3A+%228.0.0%22%2C%0A++++++++%22league%2Ffractal%22%3A+%220.13.0%22%2C%0A++++++++%22mashape%2Funirest-php%22%3A+%221.2.1%22%2C%0A++++++++%22mtdowling%2Fjmespath.php%22%3A+%222.3.0%22%2C%0A++++++++%22palex%2Fphpstructureddata%22%3A+%22v2.0.1%22%2C%0A++++++++%22psr%2Fhttp-message%22%3A+%221.0%22%2C%0A++++++++%22react%2Fpromise%22%3A+%22v2.2.1%22%2C%0A++++++++%22rollbar%2Frollbar%22%3A+%22v0.15.0%22%2C%0A++++++++%22ronanguilloux%2Fisocodes%22%3A+%221.2.0%22%2C%0A++++++++%22sendgrid%2Fsendgrid%22%3A+%222.1.1%22%2C%0A++++++++%22sendgrid%2Fsmtpapi%22%3A+%220.0.1%22%2C%0A++++++++%22symfony%2Fcss-selector%22%3A+%22v2.8.2%22%2C%0A++++++++%22symfony%2Fhttp-foundation%22%3A+%22v2.8.2%22%2C%0A++++++++%22symfony%2Fpolyfill-php54%22%3A+%22v1.1.0%22%2C%0A++++++++%22symfony%2Fpolyfill-php55%22%3A+%22v1.1.0%22%2C%0A++++++++%22thepixeldeveloper%2Fsitemap%22%3A+%223.0.0%22%2C%0A++++++++%22tijsverkoyen%2Fcss-to-inline-styles%22%3A+%221.5.5%22%2C%0A++++++++%22yiisoft%2Fyii%22%3A+%221.1.17%22%2C%0A++++++++%22heroku-sys%2Fapache%22%3A+%22%5E2.4.10%22%2C%0A++++++++%22heroku-sys%2Fnginx%22%3A+%22%7E1.8.0%22%0A++++%7D%0A%7D'
  484     1        INIT_FCALL                                               'preg_match'
  494     2        INIT_FCALL                                               'preg_quote'
          3        SEND_VAL                                                 '%22require%22'
          4        DO_ICALL                                         $4      
          5        CONCAT                                           ~5      '%7B%28%3F%28DEFINE%29%0A+++++++%28%3F%3Cnumber%3E+++-%3F+%28%3F%3D+%5B1-9%5D%7C0%28%3F%21%5Cd%29+%29+%5Cd%2B+%28%5C.%5Cd%2B%29%3F+%28%5BeE%5D+%5B%2B-%5D%3F+%5Cd%2B%29%3F+%29%0A+++++++%28%3F%3Cboolean%3E+++true+%7C+false+%7C+null+%29%0A+++++++%28%3F%3Cstring%3E++++%22+%28%5B%5E%22%5C%5C%5D%2A+%7C+%5C%5C+%5B%22%5C%5Cbfnrt%5C%2F%5D+%7C+%5C%5C+u+%5B0-9a-f%5D%7B4%7D+%29%2A+%22+%29%0A+++++++%28%3F%3Carray%3E+++++%5C%5B++%28%3F%3A++%28%3F%26json%29+%5Cs%2A+%28%3F%3A+%2C+%28%3F%26json%29+%5Cs%2A+%29%2A++%29%3F++%5Cs%2A+%5C%5D+%29%0A+++++++%28%3F%3Cpair%3E++++++%5Cs%2A+%28%3F%26string%29+%5Cs%2A+%3A+%28%3F%26json%29+%5Cs%2A+%29%0A+++++++%28%3F%3Cobject%3E++++%5C%7B++%28%3F%3A++%28%3F%26pair%29++%28%3F%3A+%2C+%28%3F%26pair%29++%29%2A++%29%3F++%5Cs%2A+%5C%7D+%29%0A+++++++%28%3F%3Cjson%3E+++%5Cs%2A+%28%3F%3A+%28%3F%26number%29+%7C+%28%3F%26boolean%29+%7C+%28%3F%26string%29+%7C+%28%3F%26array%29+%7C+%28%3F%26object%29+%29+%29%0A++++%29%0A%5E%28%3FP%3Cstart%3E%5Cs%2A%5C%7B%5Cs%2A%28%3F%3A%28%3F%26string%29%5Cs%2A%3A%5Cs%2A%28%3F%26json%29%5Cs%2A%2C%5Cs%2A%29%2A%3F%29%0A%28%3FP%3Cproperty%3E', $4
          6        CONCAT                                           ~6      ~5, '%5Cs%2A%3A%5Cs%2A%29%28%3FP%3Cvalue%3E%28%3F%26json%29%29%28%3FP%3Cend%3E.%2A%29%7Dsx'
          7        SEND_VAL                                                 ~6
          8        SEND_VAR                                                 !0
          9        SEND_REF                                                 !2
         10        DO_ICALL                                         $7      
  484    11        ASSIGN                                                   !1, $7
  496    12        INIT_FCALL                                               'var_dump'
         13        SEND_VAR                                                 !1
         14        FETCH_DIM_IS                                     ~9      !2, 'value'
         15        COALESCE                                         ~10     ~9
         16        QM_ASSIGN                                        ~10     null
         17        SEND_VAL                                                 ~10
         18        INIT_FCALL                                               'preg_last_error'
         19        DO_ICALL                                         $11     
         20        IS_EQUAL                                         ~12     $11, 6
         21        SEND_VAL                                                 ~12
         22        DO_ICALL                                                 
         23      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0

preferences:
171.37 ms | 1420 KiB | 21 Q