Description
string
strtok ( string str, string token )
strtok() splits a string (str)
into smaller strings (tokens), with each token being delimited by any
character from token.
That is, if you have a string like "This is an example string" you
could tokenize this string into its individual words by using the
space character as the token.
例子 1. strtok() example |
<?php
$string = "This is\tan example\nstring";
$tok = strtok($string, " \n\t");
while ($tok !== false) {
echo "Word=$tok<br />";
$tok = strtok(" \n\t");
}
?>
|
|
Note that only the first call to strtok uses the string argument.
Every subsequent call to strtok only needs the token to use, as
it keeps track of where it is in the current string. To start
over, or to tokenize a new string you simply call strtok with the
string argument again to initialize it. Note that you may put
multiple tokens in the token parameter. The string will be
tokenized when any one of the characters in the argument are
found.
The behavior when an empty part was found changed with PHP 4.1.0. The old
behavior returned an empty string, while the new, correct, behavior
simply skips the part of the string:
例子 2. Old strtok() behavior |
<?php
$first_token = strtok('/something', '/');
$second_token = strtok('/');
var_dump($first_token, $second_token);
?>
|
Output:
string(0) ""
string(9) "something" |
|
例子 3. New strtok() behavior |
<?php
$first_token = strtok('/something', '/');
$second_token = strtok('/');
var_dump($first_token, $second_token);
?>
|
Output:
string(9) "something"
bool(false) |
|
| 警告 |
本函数可能返回布尔值
FALSE，但也可能返回一个与 FALSE 等值的非布尔值，例如
0 或者 ""。请参阅布尔类型章节以获取更多信息。应使用
=== 运算符来测试本函数的返回值。 |
See also split() and
explode().
strstr