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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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