printf()
PHP printf() funksiyasi
❮ PHP string funksiyalari ma’lumotnomasi
Misol
Formatlangan stringni chiqaring:
<?php
$number = 9;
$str = "Beijing";
printf("There are %u million bicycles in %s.",$number,$str);
?>
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Ta’rif va qo‘llanilishi
printf() funksiyasi formatlangan stringni chiqaradi.
arg1, arg2, ++ parametrlari asosiy stringdagi foiz (%) belgilari o‘rniga qo‘yiladi. Bu funksiya "bosqichma-bosqich" ishlaydi: birinchi % belgisi o‘rniga arg1, ikkinchi % belgisi o‘rniga arg2 qo‘yiladi va hokazo.
Eslatma: Agar % belgilari argumentlardan ko‘p bo‘lsa, joy egalaridan (placeholders) foydalanishingiz kerak. Joy egasi % belgisidan keyin qo‘yiladi va argument raqami hamda "\$" dan iborat bo‘ladi. Ikkinchi misolga qarang.
Maslahat: Tegishli funksiyalar: sprintf(), vprintf(), vsprintf(), fprintf() va vfprintf()
Sintaksis
printf(format,arg1,arg2,arg++)
Parametr qiymatlari
| Parametr | Tavsif |
|---|---|
| format | Majburiy. Stringni va undagi o‘zgaruvchilarni qanday formatlashni belgilaydi. Mumkin bo‘lgan format qiymatlari:
Qo‘shimcha format qiymatlari. Ular % va harf orasiga qo‘yiladi (masalan, %.2f):
Eslatma: Agar bir nechta qo‘shimcha format qiymatlari ishlatilsa, ular yuqoridagi tartibda bo‘lishi shart. |
| arg1 | Majburiy. Format stringidagi birinchi % belgisi o‘rniga qo‘yiladigan argument |
| arg2 | Ixtiyoriy. Format stringidagi ikkinchi % belgisi o‘rniga qo‘yiladigan argument |
| arg++ | Ixtiyoriy. Format stringidagi uchinchi, to‘rtinchi va hokazo % belgilari o‘rniga qo‘yiladigan argument |
Texnik tafsilotlar
| Qaytariladigan qiymat: | Chiqarilgan stringning uzunligini qaytaradi |
|---|---|
| PHP versiyasi: | 4+ |
Ko‘proq misollar
Misol
%f format qiymatidan foydalanish:
<?php
$number = 123;
printf("%f",$number);
?>
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Misol
Joy egalaridan (placeholders) foydalanish:
<?php
$number = 123;
printf("With 2 decimals: %1\$.2f
<br>With no decimals: %1\$u",$number);
?>
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Misol
Barcha mumkin bo‘lgan format qiymatlarining namoyishi:
<?php
$num1 = 123456789;
$num2 = -123456789;
$char = 50; // The ASCII Character 50 is 2
// Note: The format value "%%" returns a percent sign
printf("%%b = %b <br>",$num1); // Binary number
printf("%%c = %c <br>",$char); // The ASCII Character
printf("%%d = %d <br>",$num1); // Signed decimal number
printf("%%d = %d <br>",$num2); // Signed decimal number
printf("%%e = %e <br>",$num1); // Scientific notation (lowercase)
printf("%%E = %E <br>",$num1); // Scientific notation (uppercase)
printf("%%u = %u <br>",$num1); // Unsigned decimal number (positive)
printf("%%u = %u <br>",$num2); // Unsigned decimal number (negative)
printf("%%f = %f <br>",$num1); // Floating-point number (local settings aware)
printf("%%F = %F <br>",$num1); // Floating-point number (not local settings aware)
printf("%%g = %g <br>",$num1); // Shorter of %e and %f
printf("%%G = %G <br>",$num1); // Shorter of %E and %f
printf("%%o = %o <br>",$num1); // Octal number
printf("%%s = %s <br>",$num1); // String
printf("%%x = %x <br>",$num1); // Hexadecimal number (lowercase)
printf("%%X = %X <br>",$num1); // Hexadecimal number (uppercase)
printf("%%+d = %+d <br>",$num1); // Sign specifier (positive)
printf("%%+d = %+d <br>",$num2); // Sign specifier (negative)
?>
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Misol
String spetsifikatorlarining namoyishi:
<?php
$str1 = "Hello";
$str2 = "Hello world!";
printf("[%s]<br>",$str1);
printf("[%8s]<br>",$str1);
printf("[%-8s]<br>",$str1);
printf("[%08s]<br>",$str1);
printf("[%'*8s]<br>",$str1);
printf("[%8.8s]<br>",$str2);
?>
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❮ PHP string funksiyalari ma’lumotnomasi
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