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Calling it never runs the body immediately — it returns a `Generator` object that implements `Iterator`, and the body only executes as the generator is advanced.",{"id":188,"topic":9,"difficulty":189,"body":190,"options":191,"correct_key":178,"explanation":200},"019f7281-51ce-74b8-ba2d-001e7641a510",2,"```php\nfunction numbers() {\n    yield 1;\n    yield 2;\n    yield 3;\n}\n\nforeach (numbers() as $n) {\n    echo $n;\n}\n```\nWhat is printed?",[192,194,196,198],{"key":175,"text":193},"0 1 2",{"key":178,"text":195},"123",{"key":181,"text":197},"1, 2, 3",{"key":184,"text":199},"Nothing is printed because generator functions cannot be used directly in a `foreach` loop","`numbers()` returns a `Generator`, which is directly iterable with `foreach`. Each iteration yields the next value (1, then 2, then 3), and `echo $n` prints them back to back with no separator: `123`.",{"id":202,"topic":9,"difficulty":171,"body":203,"options":204,"correct_key":181,"explanation":213},"019f7281-51d0-73c9-ab23-02809847d086","When exactly does the code inside a generator function start executing?",[205,207,209,211],{"key":175,"text":206},"Immediately when the function is called, before the caller does anything else",{"key":178,"text":208},"Only after the entire script has completely finished running from start to end",{"key":181,"text":210},"When the generator is first advanced, e.g. via `foreach` or `current()`\u002F`next()`",{"key":184,"text":212},"When PHP parses and compiles the file that defines the generator function","Calling a generator function only creates the `Generator` object; execution is lazy. The body runs up to the first `yield` only once something starts pulling values from it (`foreach`, `->current()`, `->next()`, `->send()`, etc.).",{"id":215,"topic":9,"difficulty":189,"body":216,"options":217,"correct_key":184,"explanation":226},"019f7281-51d6-781a-95ea-6282c68e18a5","```php\nfunction pairs() {\n    yield 'a' => 1;\n    yield 'b' => 2;\n}\n\nforeach (pairs() as $k => $v) {\n    echo \"$k=$v \";\n}\n```\nWhat is printed?",[218,220,222,224],{"key":175,"text":219},"0=1 1=2",{"key":178,"text":221},"a=1, b=2",{"key":181,"text":223},"1=a 2=b",{"key":184,"text":225},"a=1 b=2 ","`yield 'a' => 1;` yields the value `1` with the explicit key `'a'`, and likewise for `'b' => 2`. `foreach ($gen as $k => $v)` receives exactly those key\u002Fvalue pairs, printing `a=1 b=2 `.",{"id":228,"topic":9,"difficulty":171,"body":229,"options":230,"correct_key":175,"explanation":239},"019f7281-51db-7591-a9a4-0bee22320837","By default, without any additional extension or library, how does a standard PHP script execute?",[231,233,235,237],{"key":175,"text":232},"Synchronously, one statement after another, in a single thread",{"key":178,"text":234},"Multiple statements automatically run in parallel across CPU cores",{"key":181,"text":236},"Each function call automatically spawns a new OS thread",{"key":184,"text":238},"All I\u002FO operations are non-blocking by default","Plain PHP is single-threaded and synchronous: statements execute in order, and a blocking call (like a slow HTTP request) stops everything else in that script until it returns. True parallelism or non-blocking I\u002FO requires extra tools (`pcntl_fork`, Fibers plus an event-loop library, Swoole, etc.).",{"id":241,"topic":9,"difficulty":189,"body":242,"options":243,"correct_key":178,"explanation":252},"019f7281-51de-726e-baec-184dbbb2c623","```php\nfunction slowTask($seconds) {\n    sleep($seconds);\n    return 'done';\n}\n\n$start = microtime(true);\nslowTask(1);\nslowTask(1);\n$elapsed = microtime(true) - $start;\n```\nApproximately what is `$elapsed`, and why?",[244,246,248,250],{"key":175,"text":245},"~1 second, because PHP automatically runs both `slowTask()` calls concurrently by default",{"key":178,"text":247},"~2 seconds, because each blocking `sleep()` call must fully finish before the next one starts",{"key":181,"text":249},"~0 seconds, because PHP schedules `sleep()` calls to run in the background automatically",{"key":184,"text":251},"It cannot be measured with `microtime()`, since PHP hides timing details from userland code","`sleep()` blocks the current (single) thread of execution. The second `slowTask(1)` only starts after the first one has fully returned, so the two 1-second sleeps add up sequentially to roughly 2 seconds.",{"fields":254,"seniorities":424,"interview_shapes":425,"locales":430,"oauth":432,"question_count":435,"coach_enabled":436,"jd_match_enabled":436},[255,266,286,303,327,340,359,378,398,405,411,418],{"key":5,"name_tr":6,"name_en":6,"sort":171,"specializations":256},[257,260,261,262,263,264,265],{"key":258,"name":259,"field":5},"general","Genel",{"key":154,"name":155,"field":5},{"key":166,"name":167,"field":5},{"key":157,"name":158,"field":5},{"key":150,"name":151,"field":5},{"key":160,"name":161,"field":5},{"key":163,"name":164,"field":5},{"key":267,"name_tr":268,"name_en":268,"sort":189,"specializations":269},"frontend","Frontend",[270,271,274,277,280,283],{"key":258,"name":259,"field":267},{"key":272,"name":273,"field":267},"javascript","JavaScript",{"key":275,"name":276,"field":267},"typescript","TypeScript",{"key":278,"name":279,"field":267},"react","React",{"key":281,"name":282,"field":267},"vue","Vue",{"key":284,"name":285,"field":267},"angular","Angular",{"key":287,"name_tr":288,"name_en":288,"sort":289,"specializations":290},"fullstack","Fullstack",3,[291,292,293,294,295,296,297,298,299,300,301,302],{"key":258,"name":259,"field":287},{"key":154,"name":155,"field":5},{"key":166,"name":167,"field":5},{"key":157,"name":158,"field":5},{"key":150,"name":151,"field":5},{"key":160,"name":161,"field":5},{"key":163,"name":164,"field":5},{"key":272,"name":273,"field":267},{"key":275,"name":276,"field":267},{"key":278,"name":279,"field":267},{"key":281,"name":282,"field":267},{"key":284,"name":285,"field":267},{"key":304,"name_tr":305,"name_en":305,"sort":306,"specializations":307},"devops-cloud","DevOps \u002F Cloud",4,[308,309,312,315,318,321,324],{"key":258,"name":259,"field":304},{"key":310,"name":311,"field":304},"aws","AWS",{"key":313,"name":314,"field":304},"gcp","GCP",{"key":316,"name":317,"field":304},"azure","Azure",{"key":319,"name":320,"field":304},"kubernetes","Kubernetes",{"key":322,"name":323,"field":304},"terraform","Terraform",{"key":325,"name":326,"field":304},"linux","Linux",{"key":328,"name_tr":329,"name_en":329,"sort":330,"specializations":331},"ai-engineer","AI Engineer",5,[332,333,334,337],{"key":258,"name":259,"field":328},{"key":166,"name":167,"field":328},{"key":335,"name":336,"field":328},"llm-rag","LLM\u002FRAG",{"key":338,"name":339,"field":328},"mlops","MLOps",{"key":341,"name_tr":342,"name_en":343,"sort":344,"specializations":345},"database","Veritabanı","Database",6,[346,347,350,353,356],{"key":258,"name":259,"field":341},{"key":348,"name":349,"field":341},"postgresql","PostgreSQL",{"key":351,"name":352,"field":341},"mysql","MySQL",{"key":354,"name":355,"field":341},"mongodb","MongoDB",{"key":357,"name":358,"field":341},"redis","Redis",{"key":360,"name_tr":361,"name_en":362,"sort":363,"specializations":364},"mobile","Mobil","Mobile",7,[365,366,369,372,375],{"key":258,"name":259,"field":360},{"key":367,"name":368,"field":360},"ios-swift","iOS (Swift)",{"key":370,"name":371,"field":360},"android-kotlin","Android (Kotlin)",{"key":373,"name":374,"field":360},"flutter","Flutter",{"key":376,"name":377,"field":360},"react-native","React Native",{"key":143,"name_tr":379,"name_en":144,"sort":380,"specializations":381},"Güvenlik",8,[382,383,386,389,392,395],{"key":258,"name":259,"field":143},{"key":384,"name":385,"field":143},"appsec","AppSec",{"key":387,"name":388,"field":143},"offensive-pentest","Offensive \u002F Pentest",{"key":390,"name":391,"field":143},"cloud-security","Cloud Security",{"key":393,"name":394,"field":143},"devsecops","DevSecOps",{"key":396,"name":397,"field":143},"blue-team-incident","Blue Team \u002F Incident",{"key":399,"name_tr":400,"name_en":401,"sort":402,"specializations":403},"qa-test-automation","QA \u002F Test Otomasyonu","QA \u002F Test Automation",9,[404],{"key":258,"name":259,"field":399},{"key":406,"name_tr":407,"name_en":407,"sort":408,"specializations":409},"data-engineer","Data Engineer",10,[410],{"key":258,"name":259,"field":406},{"key":412,"name_tr":413,"name_en":414,"sort":415,"specializations":416},"game-dev","Oyun Geliştirme","Game Development",11,[417],{"key":258,"name":259,"field":412},{"key":419,"name_tr":420,"name_en":420,"sort":421,"specializations":422},"ml-engineer","ML Engineer",12,[423],{"key":258,"name":259,"field":419},[14,15,16],{"junior":426,"mid":428,"senior":429},{"questions":427,"median_sec":3},20,{"questions":427,"median_sec":3},{"questions":427,"median_sec":3},[431,10],"tr",[433,434],"google","github",21750,true]