Description
string
strtok ( string arg1, string arg2)
strtok() splits a string (arg1)
into smaller strings (tokens), with each token being delimited by any
character from arg2.
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.
Esempio 1. strtok() example
<?php
$string = "This is\tan example\nstring";
/* Use tab and newline as tokenizing characters as well */
$tok = strtok($string, " \n\t");
while ($tok) {
echo "Word=$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:
Esempio 2. Old strtok() behavior
<?php
$first_token = strtok('/something', '/');
$second_token = strtok('/');
var_dump($first_token, $second_token);
?>
|
Output:
string(0) ""
string(9) "something" |
|
Esempio 3. New strtok() behavior
<?php
$first_token = strtok('/something', '/');
$second_token = strtok('/');
var_dump($first_token, $second_token);
?>
|
Output:
string(9) "something"
bool(false) |
|
Also be careful that your tokens may be equal to "0". This
evaluates to FALSE in conditional expressions.
See also split() and
explode().
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