(PHP 4, PHP 5, PHP 7)
uniqid — 锟斤拷锟斤拷一锟斤拷唯一ID
$prefix = ""
[, bool $more_entropy = false
]] ) : string锟斤拷取一锟斤拷锟斤拷前缀锟斤拷锟斤拷锟节碉拷前时锟斤拷微锟斤拷锟斤拷锟斤拷唯一ID锟斤拷
锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟缴帮拷全锟斤拷锟杰碉拷值锟斤拷锟斤拷应锟斤拷锟节硷拷锟斤拷锟斤拷途锟斤拷锟斤拷锟斤拷要锟斤拷全锟斤拷锟杰碉拷值锟斤拷锟斤拷锟斤拷使锟斤拷openssl_random_pseudo_bytes()锟斤拷
锟剿猴拷锟斤拷锟斤拷锟斤拷证锟斤拷锟斤拷值锟斤拷唯一锟皆★拷
锟斤拷锟节撅拷锟斤拷锟斤拷锟较低呈癸拷锟� NTP 锟斤拷锟斤拷锟斤拷锟狡凤拷锟斤拷锟斤拷锟较低筹拷锟绞憋拷洌拷锟斤拷锟较低呈憋拷渚拷锟斤拷锟斤拷锟斤拷浠拷锟�
锟斤拷锟解，锟斤拷锟斤拷/锟竭程匡拷锟杰诧拷锟结返锟斤拷唯一锟斤拷 ID锟斤拷
锟斤拷 more_entropy 锟斤拷锟斤拷锟斤拷唯一锟皆的革拷锟绞★拷
prefix锟斤拷锟矫的诧拷锟斤拷锟斤拷锟斤拷锟界：锟斤拷锟斤拷诙锟教拷锟斤拷锟斤拷峡锟斤拷锟斤拷锟酵晃拷锟斤拷锟斤拷锟轿ㄒ籌D锟斤拷
prefix为锟秸ｏ拷锟津返回碉拷锟街凤拷锟斤拷锟斤拷锟斤拷为13锟斤拷more_entropy 为
TRUE锟斤拷锟津返回碉拷锟街凤拷锟斤拷锟斤拷锟斤拷为23锟斤拷
more_entropy
锟斤拷锟斤拷锟斤拷锟轿� TRUE锟斤拷uniqid() 锟斤拷锟节凤拷锟截碉拷锟街凤拷锟斤拷锟斤拷尾锟斤拷锟接讹拷锟斤拷锟斤拷兀锟绞癸拷锟絚ombined linear congruential generator锟斤拷锟斤拷
使锟斤拷唯一ID锟斤拷锟斤拷唯一锟皆★拷
锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷式锟斤拷唯一ID锟斤拷
锟剿猴拷锟斤拷努锟斤拷锟斤拷锟斤拷唯一识锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街わ拷锟斤拷锟街碉拷锟轿ㄒ伙拷浴锟�
Example #1 uniqid() 锟斤拷锟斤拷
<?php
/* A uniqid, like: 4b3403665fea6 */
printf("uniqid(): %s\r\n", uniqid());
/* We can also prefix the uniqid, this the same as
* doing:
*
* $uniqid = $prefix . uniqid();
* $uniqid = uniqid($prefix);
*/
printf("uniqid('php_'): %s\r\n", uniqid('php_'));
/* We can also activate the more_entropy parameter, which is
* required on some systems, like Cygwin. This makes uniqid()
* produce a value like: 4b340550242239.64159797
*/
printf("uniqid('', true): %s\r\n", uniqid('', true));
?>
Note:
锟斤拷Cygwin锟斤拷锟斤拷锟铰ｏ拷为锟斤拷使锟剿猴拷锟斤拷锟杰癸拷锟斤拷锟斤拷锟斤拷
more_entropy锟斤拷锟斤拷锟斤拷锟斤拷为TRUE锟斤拷