PHP string replacement, splitting and concatenation methods, PHP string replacement and splitting_PHP tutorial

PHP string replacement, splitting and joining methods, php string replacement and splitting

The examples in this article describe the replacement, splitting and joining methods of php strings. Share it with everyone for your reference, the details are as follows:

String replacement

1. Perform a regular expression search and replace
Copy code The code is as follows: mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )

Search for the part of the subject that matches pattern and replace it with replacement.

2. Substring replacement
Copy code The code is as follows: mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )
This function returns a string or array. This string or array is the result of replacing all search in subject with replace.

Splitting and concatenating strings

Separate strings by a regular expression

Description

1. array preg_split ( string $pattern , string $subject [, int $limit = -1 [, int $flags = 0 ]] )

Separates the given string by a regular expression.

2. explode — Use one string to split another string

Description:

array explode ( string $separator , string $string [, int $limit ] )

$str = 'one|two|three|four';
// 正数的 limit
print_r(explode('|', $str, 2));
// 负数的 limit（自 PHP 5.1 起）
print_r(explode('|', $str, -1));

The above routine will output:

Array
(
  [0] => one
  [1] => two|three|four
)
Array
(
  [0] => one
  [1] => two
  [2] => three
)

3. string implode(string glue, array pieces) ———— The connected array is called string

$lan=array("a","b","c");
implode("+", $lan);//a+b+c

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