PHP string substitution, segmentation and connection method _php tips

This article illustrates the substitution, segmentation, and connection methods of PHP strings. Share to everyone for your reference, specific as follows:

Substitution of strings

1. Perform search and replace of a regular expression

Copy Code code as follows:

Mixed preg_replace (mixed $pattern, mixed $replacement, mixed $subject [, int $limit =-1 [, int & $count]])

Searches the part of the subject that matches the pattern and replaces it with replacement.

2. Substring substitution

Copy Code code as follows:

Mixed Str_replace (mixed $search, mixed $replace, mixed $subject [, int & $count])

The function returns a string or array. The string or array is the result of replacing all search in subject with replace.

Segmentation and concatenation of strings

Separating strings with 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 a string to split another string

Description

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

$str = ' One|two|three|four ';
Positive limit
print_r (Explode (' | ', $STR, 2));
Negative limit (from PHP 5.1)
Print_r (Explode (' | ', $STR,-1));

The above routines will output:

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

3. String implode (string glue, array pieces) ———— connection array is called a string

$lan =array ("A", "B", "C");
Implode ("+", $lan);//a+b+c

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