Yadda kuke yin aiki da kirtani a PHP?

Question

IT Interview Practice · Accepted Answer

PHP yana da taimako mai yawa game da kirtani: nau'ikan lamba daban-daban (tare da hanyoyin haɓakawa daban-daban), haɗe-haɗe, da gida mai girma na ayyukan kirtani. Fahimtar bambancin lamba da saitin aiyu yana da buƙatar kowace rana. ## Lamba: gida vs lamba (haɓakawa) ```php name}"; // {} for complex expressions inside double quotes ``` Bambanci mai mahimmanci: **lamba biyu suna haɓaka masu ƙimar** (`$name` ana canza shi da kimar sa), **lamba gida suna nishadi** (sauri, babu haɓakawa). Yi amfani da `{}` don maganganu masu rikitarwa kamar kaddarorin abin aiki. ## Haɗe-haɗe ```php $greeting = "Hello, " . $name . "!"; // . is the concatenation operator (NOT +) $greeting .= " Welcome."; // .= appends ``` PHP yana amfani da `.` don haɗe-haɗen kirtani (ba `+`, wanda shine na lamba) — wurin ruɗi na gida. ## Heredoc da Nowdoc (multi-line) ```php $html = <<$name // heredoc — interpolates (like double quotes) HTML; $raw = <<<'TEXT' Literal $name // nowdoc (quoted label) — no interpolation (like single quotes) TEXT; ``` ## Ayyukan kirtani na muhimmantu ```php strlen($s); // length strtoupper($s); strtolower($s); trim($s); // remove surrounding whitespace str_replace("old", "new", $s); strpos($s, "needle"); // find position (false if not found — use === false) substr($s, 0, 5); // extract a substring explode(",", $csv); // split into an array implode(",", $array); // join an array into a string sprintf("%.2f", 3.14159); // formatted output → "3.14" str_contains($s, "x"); // PHP 8: cleaner substring check ``` ## Jiya multibyte (Unicode) ```php mb_strlen($s); // ✅ correct length for multi-byte (UTF-8) text strlen($s); // ⚠️ counts BYTES, not characters — wrong for non-ASCII ``` Gabaɗaya rubutu da ba ne na ASCII/Unicode, yi amfani da ayyukan **`mb_*`** (`mb_strlen`, `mb_substr`) — ayyukan sauya suna ƙidaya bytes, ba harufa ba, da saka akan rubutu masu nau'i maraya. ## Me ya sa haka ya mata Mani da kirtani yana cikin web development ko'ina (gina HTML, aiwatarwa da saiti, saurare saili, karanta bayanai), don haka fahimtar hanyar PHP ta yin aiki da kirtani yana da buƙatar kowace rana. Sakamakon abubuwa masu aiki na hakika: bambancin **lamba-vs-lamba-gida** (lamba biyu suna haɓaka masu ƙimar, lamba gida suna nishadi) yana da mahimmanci sosai da kuskure da yawa na ƙungiya; PHP yana amfani da **`.` don haɗe-haɗe** (ba `+`); da PHP yana da gida mai girma na ayyukan kirtani don ayyuka na uba (neman, sakewa, rarasa/haɗe, saurare). /',IMPORTANT, alal jiya ɗaya aikaccen da aka ɗaukaka rubutu da ba ne na Ingilishi/Unicode, fahimtar amfani da ayyukan **`mb_*` (multibyte)** maimakon sauya (wanda sune ƙidaya bytes, ba harufa ba, da saka kirtani masu nau'i maraya) yana rigije kuskure na ainihi. Sanin aini game da hanyar lamba ta PHP, haɗe-haɗe, da gida na ayyukan kirtani — gami da jiya multibyte — yana da mahimmanci kuma yana da mahimmanci ga aiki da kirtani na yau da kullun da web development ta kunshi.

Lamba: gida vs lamba (haɓakawa)

Haɗe-haɗe

Heredoc da Nowdoc (multi-line)

Ayyukan kirtani na muhimmantu

Jiya multibyte (Unicode)

Me ya sa haka ya mata

Tambayoyi masu alaƙa