PHP haqida

PHP dastlab 'Personal home page' so'zlarining qisqartmasi bo'lgan. Hozirda esa "PHP: Hypertext Preprocessor" ning qisqartmasi sifatida ko'riladi.

PHP-da "echo" va "print" o'rtasida ba'zi farqlar mavjud. Quyida ularning asosiy farqlari keltirilgan:

`echo`

Bir nechta argument qabul qiladi: "echo" bir yoki bir nechta argumentlarni qabul qila oladi, masalan:phpCopy codeecho "Salom, ", "dunyo!";
Yakunlanmagan qiymat qaytaradi: "echo" qiymatni qaytarmaydi, shuning uchun u qiymatni qaytarish bilan ishlatilmaydi. Asosan, "echo" faqat ekranga ma'lumot chiqaradi.
Joriy PHP versiyalari: "echo" PHP-da juda keng tarqalgan va ko'p hollarda tezroq ishlaydi, chunki u minimal funksiyalarga ega.

`print`

Bitta argument qabul qiladi: "print" faqat bitta argumentni qabul qiladi. Misol uchun:phpCopy codeprint "Salom, dunyo!";
Qiymat qaytaradi: "print" qiymat sifatida 1 qaytaradi. Bu, masalan, ifodalar yoki shartli operatorlarda ishlatilishi mumkin:phpCopy codeif (print "Salom!") { // Agar print() muvaffaqiyatli bo'lsa, bu kod bajariladi }
Ko'proq ishlatiladi: "print" odatda biror qiymat qaytarishni talab qiladigan kontekstlarda ishlatiladi, lekin "echo" dan biroz sekinroq bo'lishi mumkin.

Xulosa

"echo" ko'proq ma'lumotlarni tezroq chiqarish uchun ishlatiladi va bir nechta argumentlarni qabul qilishi mumkin.
"print" bitta argumentni qabul qiladi va qiymat sifatida 1 qaytaradi, bu ba'zi hollarda foydali bo'lishi mumkin.

Har ikkala funksiya ham ekranga ma'lumot chiqarish uchun ishlatiladi, ammo ularning ishlash usullari va imkoniyatlari bir-biridan farq qiladi.

PHP da masala

Masala: // Write the function squared_sum here
echo squared_sum([56, 65, 26, 86, 66, 34, 78, 74, 67, 18, 34, 73, 45, 67, 75, 10, 60, 80, 74, 16, 86, 34, 12, 23, 42, 72, 36, 3, 73, 9, 92, 81, 94, 54, 97, 74, 45, 55, 70, 94, 96, 81, 86, 86, 84, 4, 32, 8, 96, 86, 87, 18, 84, 87, 59, 48, 32, 90, 17, 22, 82, 79, 66, 28, 17, 14, 80, 83, 66, 36, 21, 89, 68, 2, 51, 65, 20, 87, 48, 5, 1, 16, 60, 53, 84, 90, 16, 2, 37, 73, 57, 70, 57, 69, 68, 1, 24, 40, 72, 97]);

2-xil usulda bajarilishini ko'rib chiqamiz

1-usul

function squared_sum($numbers){

$new_array = [];

foreach ($numbers as $num) {

array_push($new_array, $num ** 2);

}

$sum = 0;

foreach ($new_array as $sq_num) {

$sum = $sum + $sq_num;

}

return $sum;

}

echo squared_sum([56, 65, 26, 86, 66, 34, 78, 74, 67, 18, 34, 73, 45, 67, 75, 10, 60, 80, 74, 16, 86, 34, 12, 23, 42, 72, 36, 3, 73, 9, 92, 81, 94, 54, 97, 74, 45, 55, 70, 94, 96, 81, 86, 86, 84, 4, 32, 8, 96, 86, 87, 18, 84, 87, 59, 48, 32, 90, 17, 22, 82, 79, 66, 28, 17, 14, 80, 83, 66, 36, 21, 89, 68, 2, 51, 65, 20, 87, 48, 5, 1, 16, 60, 53, 84, 90, 16, 2, 37, 73, 57, 70, 57, 69, 68, 1, 24, 40, 72, 97]);

2-usul (osonroq usul)

function squared_sum ($numbers) { $sum =0; foreach($numbers as $num) { $sum += $num*$num; } return $sum; }

echo squared_sum([56, 65, 26, 86, 66, 34, 78, 74, 67, 18, 34, 73, 45, 67, 75, 10, 60, 80, 74, 16, 86, 34, 12, 23, 42, 72, 36, 3, 73, 9, 92, 81, 94, 54, 97, 74, 45, 55, 70, 94, 96, 81, 86, 86, 84, 4, 32, 8, 96, 86, 87, 18, 84, 87, 59, 48, 32, 90, 17, 22, 82, 79, 66, 28, 17, 14, 80, 83, 66, 36, 21, 89, 68, 2, 51, 65, 20, 87, 48, 5, 1, 16, 60, 53, 84, 90, 16, 2, 37, 73, 57, 70, 57, 69, 68, 1, 24, 40, 72, 97]);