Description of string functions in PHP_PHP tutorial

There are many string manipulation functions in PHP, the important ones are the following:

(1)echo, print, printf, sprintf
The first two functions are to output strings. If there is a variable name in the string, it will be replaced with its value.
The last two functions are similar to C Function with the same name.

(2)strchr, strlen, strtok, strrchr, strrev, strstr, strtolower,
strtoupper, substr, ucfirst
These are commonly used string manipulation functions, some of which have the same meaning as the functions of the same name in C .
strrev is to flip a string.
The meaning of strtolower and strtoupper should not need to be explained.
ucfirst is to turn the first character of the string into uppercase.
substr is to return the string A substring of
(3)Chr,Ord

Similar to the function of the same name in C.

(4)explode, implode, join

These are functions related to arrays.

explode(string, separator) returns an array generated by dividing the string at the separator.
implode(array, separator) returns a string formed by inserting a separator between each element of the array.
Join has the same meaning as implode.

(5)Chop

Remove the whitespace at the end of the string.

(6)htmlspecialchars

Replace the HTML special characters in the string with their names, for example, "
(7)nl2br Add "

" before each carriage return in the string.

(8)AddSlashes,StripSlashes

Add and remove "\" to the characters that need to be added to the string to be used for database query.

(9)parse_str

Parse strings of type "name1=value1&name2=value2&..." into some variables.

For example:
parse_str("a=1&b=2");
Generate two variables, $a and $b, with values ​​1 and 2 respectively.
If there are two pairs of names/values ​​with the same name part, the value of the latter one will overwrite the previous one.
If these two pairs of names/values ​​have the same name part, Pairs of names have "[]" at the end, for example "a[]=1&a[]=2", then an array $a is generated, and the two elements are 1, 2

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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/589774.htmlTechArticleThere are many string manipulation functions in PHP, the important ones are the following: (1) echo, print , printf, sprintf The first two functions are to output strings. If there is a variable name in the string, it will be replaced with its...