Detailed explanation of php5 and mysql5 web development technology-2 String operation_PHP tutorial

String learning mainly involves mastering built-in functions.

There are too many functions, and I haven’t remembered many yet. I will simply record the functions first and add them later.

1. Definition method: single quote, double quote, or {}

{} is convenient for displaying index arrays, and double quotes parse variables

2. Manually convert string data

symbol to implement

The addslashes() and addcslashes() functions can be used to customize the transfer

3. Serialization and deserialization serialize(), unserialize()

4. String sorting

trim(), ltrim(), rtrim()

Remove spaces, newline characters (n, r), horizontal and vertical tab characters (t, v) and string terminators (

5. Format string

nl2br()

wordwrap()

strtolower()

strtoupper()

ucfirst()

ucwords()

6. Split

explode() and join() with the same name

Example: explode("@",$email) ;

7. String interception

substr(‘target string’, starting point, end point)

8. strlen() / mb_strlen()

9. str_word_count()

Combined with array_count_values() to count the number of word occurrences

10. Search www.2cto.com

strstr($string,"keyword") ,stristr() ,strrch()

strpos()

str_repeat()

substr_count()

11. Processing

str_replace()

substr_replace()

strrev()

htmlspecialchars(), htmlentitles() Convert special characters such as <,>,&, " into html entities

strip_tags() clear html tags

strncmp(),strcmp()

Strok() parses string

strpbrk()

strspn(),strcspn()

str_replace()

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