(PHP 4, PHP 5, PHP 7)
strspn — 锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷全锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷指锟斤拷锟街凤拷锟斤拷锟斤拷锟叫的碉拷一锟斤拷锟接达拷锟侥筹拷锟饺★拷
$subject
, string $mask
[, int $start
[, int $length
]] ) : int
锟斤拷锟斤拷 subject 锟斤拷全锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷 mask 锟叫的碉拷一锟斤拷锟斤拷锟斤拷锟街凤拷(锟斤拷锟街凤拷锟斤拷)锟侥筹拷锟饺★拷
锟斤拷锟绞★拷锟斤拷锟� start 锟斤拷 length 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 subject 锟街凤拷锟斤拷锟斤拷锟斤拷锟街革拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫э拷锟斤拷锟酵拷诘锟斤拷锟� strspn(substr($subject, $start, $length), $mask)锟斤拷锟斤拷锟斤拷锟斤拷息锟斤拷锟轿硷拷 substr 锟斤拷锟斤拷
锟斤拷锟斤拷锟叫ｏ拷
<?php
$var = strspn("42 is the answer to the 128th question.", "1234567890");
?>
subject 锟叫碉拷一锟斤拷全锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷 '1234567890' 锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷
subject锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷
mask锟斤拷锟斤拷址锟斤拷斜锟�
start
subject 锟侥匡拷始锟斤拷锟轿伙拷谩锟�
锟斤拷锟� start 锟斤拷锟斤拷锟矫诧拷锟斤拷锟角非革拷锟侥ｏ拷strspn() 锟斤拷锟斤拷 subject 锟侥碉拷 start 锟斤拷位锟矫匡拷始锟斤拷椤ｏ拷锟斤拷纾拷锟斤拷址锟斤拷锟� 'abcdef' 锟叫ｏ拷锟斤拷 0 锟斤拷位锟矫碉拷锟街凤拷锟斤拷 'a'锟斤拷锟节讹拷锟斤拷位锟矫碉拷锟街凤拷锟斤拷 'c'锟斤拷锟饺等★拷
锟斤拷锟� start 锟斤拷锟斤拷锟矫诧拷锟斤拷为锟斤拷锟斤拷锟斤拷strspn() 锟斤拷锟斤拷 subject 锟斤拷尾锟斤拷锟斤拷锟斤拷锟斤拷 start 锟斤拷位锟矫匡拷始锟斤拷锟� subject锟斤拷
length
subject 锟叫硷拷锟侥筹拷锟饺★拷
锟斤拷锟� length 锟斤拷锟斤拷锟矫诧拷锟斤拷为锟角革拷锟斤拷锟斤拷锟斤拷么锟斤拷锟斤拷锟斤拷始位锟矫匡拷始锟斤拷锟斤拷锟� subject 锟斤拷 length 锟斤拷锟斤拷锟饺碉拷锟街凤拷锟斤拷
锟斤拷锟� length 锟斤拷锟斤拷锟矫诧拷锟斤拷为锟斤拷锟斤拷锟斤拷锟斤拷么锟斤拷锟斤拷锟斤拷始位锟矫匡拷始锟斤拷直锟斤拷锟斤拷 subject 尾锟斤拷锟斤拷始锟斤拷 length 锟斤拷位锟矫ｏ拷锟斤拷 subject 锟斤拷锟叫硷拷椤�
锟斤拷锟斤拷 str1 锟叫碉拷一锟斤拷全锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷 str2 锟斤拷围锟斤拷锟街凤拷锟斤拷锟侥筹拷锟饺★拷
| 锟芥本 | 说锟斤拷 |
|---|---|
| 4.3.0 |
锟斤拷锟斤拷 start 锟斤拷 length 锟斤拷锟斤拷锟斤拷
|
Example #1 strspn() 锟斤拷锟斤拷
<?php
echo strspn("foo", "o", 1, 2); // 锟斤拷印: 2
?>
锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�
int(0) int(2) int(1)
Note: 锟剿猴拷锟斤拷锟缴帮拷全锟斤拷锟节讹拷锟斤拷锟狡讹拷锟斤拷