PHP unpack() Funksie
❮ PHP Misc Reference
Voorbeeld
Pak data uit 'n binêre string:
<?php
$data = "PHP";
print_r(unpack("C*",$data));
?>
Definisie en gebruik
Die unpack()-funksie pak data uit 'n binêre string uit.
Sintaksis
Parameterwaardes
| Parameter |
Description |
| format |
Required. Specifies the format to use when unpacking data.
Possible values:
- a - NUL-padded string
- A - SPACE-padded string
- h - Hex string, low nibble first
- H - Hex string, high nibble first
- c - signed char
- C - unsigned char
- s - signed short (always 16 bit, machine byte order)
- S - unsigned short (always 16 bit, machine byte order)
- n - unsigned short (always 16 bit, big endian byte order)
- v - unsigned short (always 16 bit, little endian byte order)
- i - signed integer (machine dependent size and byte order)
- I - unsigned integer (machine dependent size and byte order)
- l - signed long (always 32 bit, machine byte order)
- L - unsigned long (always 32 bit, machine byte order)
- N - unsigned long (always 32 bit, big endian byte order)
- V - unsigned long (always 32 bit, little endian byte order)
- q - signed long long (always 64 bit, machine byte order)
- Q - unsigned long long (always 64 bit, machine byte order)
- J - unsigned long long (always 64 bit, big endian byte order)
- P - unsigned long long (always 64 bit, little endian byte order)
- f - float (machine dependent size and representation)
- g - float (machine dependent size, little endian byte order)
- G - float (machine dependent size, big endian byte order)
- d - double (machine dependent size and representation)
- e - double (machine dependent size, little endian byte order)
- E - double (machine dependent size, big endian byte order)
- x - NUL byte
- X - Back up one byte
- Z - NUL-padded string
- @ - NUL-fill to absolute
|
| data |
Required. Specifies the binary data to be unpacked |
| offset |
Optional. Specifies where to start unpacking from. Default is 0. |
Tegniese besonderhede
| Terugkeerwaarde: |
Wys 'n skikking op sukses, of ONWAAR op mislukking. |
| PHP weergawe: |
4+ |
| Veranderinglog: |
PHP 7.2 - float en double ondersteun nou beide groot en klein endian.
PHP 7.1 - Bygevoeg die opsionele offset parameter.
PHP 5.5.0 - Die volgende veranderinge is gemaak vir Perl-versoenbaarheid: Die "a"-kode behou nou agterste NULL-grepe.
Die "A"-kode stroop nou alle agterste ASCII-witspasie.
Die "Z"-kode is bygevoeg vir NULL-opgevulde stringe, en verwyder agterste NULL-grepe. |
Meer voorbeelde
Voorbeeld
Pak data uit:
<?php
$data = "PHP";
print_r(unpack("C*myint",$data));
?>
Voorbeeld
Pak data uit:
<?php
$bin = pack("c2n2",0x1234,0x5678,65,66);
print_r(unpack("c2chars/n2int",$bin));
?>
❮ PHP Misc Reference
