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Detailed graphic explanation of the replacement, splitting and joining methods of PHP strings

墨辰丷
墨辰丷Original
2018-06-02 10:20:191747browse

This article mainly introduces the replacement, splitting and connecting methods of PHP strings, and analyzes the functions and usage of functions such as preg_replace, str_replace, preg_split, explode and implode. Friends in need can refer to it

String replacement

1. Perform a regular expression search and replace

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 the pattern and replace it with replacement.

2. Substring replacement

Code 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

Instructions

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

Through a regular expression Separate the given string with the formula.

2. explode — Use one string to split another string

Instructions:

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 a string

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

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