PHP printf() Fungsi
Contoh
Keluarkan string yang diformat:
<?php
$number = 9;
$str = "Beijing";
printf("There are %u million bicycles in %s.",$number,$str);
?>
Definisi dan Penggunaan
Fungsi printf() mengeluarkan string yang diformat.
Parameter arg1, arg2, ++ akan disisipkan pada tanda persen (%) di string utama. Fungsi ini bekerja "langkah demi langkah". Pada tanda % pertama, arg1 dimasukkan, pada tanda % kedua, arg2 dimasukkan, dst.
Catatan: Jika ada lebih banyak % tanda daripada argumen, Anda harus menggunakan placeholder. Placeholder disisipkan setelah tanda %, dan terdiri dari nomor argumen dan "\$". Lihat contoh dua.
Tip: Fungsi terkait: sprintf() , vprintf() , vsprintf() , fprintf() dan vfprintf()
Sintaksis
printf(format,arg1,arg2,arg++)
Nilai Parameter
Parameter | Description |
---|---|
format | Required. Specifies the string and how to format the variables in it. Possible format values:
Additional format values. These are placed between the % and the letter (example %.2f):
Note: If multiple additional format values are used, they must be in the same order as above. |
arg1 | Required. The argument to be inserted at the first %-sign in the format string |
arg2 | Optional. The argument to be inserted at the second %-sign in the format string |
arg++ | Optional. The argument to be inserted at the third, fourth, etc. %-sign in the format string |
Detail Teknis
Nilai Kembali: | Mengembalikan panjang string yang dihasilkan |
---|---|
Versi PHP: | 4+ |
Lebih Banyak Contoh
Contoh
Menggunakan nilai format %f:
<?php
$number = 123;
printf("%f",$number);
?>
Contoh
Penggunaan placeholder:
<?php
$number = 123;
printf("With 2 decimals: %1\$.2f
<br>With no decimals: %1\$u",$number);
?>
Contoh
Demonstrasi dari semua kemungkinan nilai format:
<?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)
?>
Contoh
Demonstrasi penentu string:
<?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);
?>
Referensi String PHP