PHP some common string functions

This article introduces some of the commonly used string functions in PHP, here to share to you, you can also give a friend in need a little reference, let's take a look at it

1. Get string length strlen ()

2. Remove blank string trim (), LTrim (), RTrim () to remove whitespace from the end of the string, the beginning of the string, and the ending of the string.

Trim (), LTrim (), RTrim () function delete the characters by default:

symbols	ASCII code	meaning
“ ”	0x20	Space
"\ T"	0x09	Tabs
"\ n"	0X0A	Line break
"\ r"	0x0D	Carriage return character
"The"	0x00	Null character
"\X0B"	0x0B	Portrait tab

Examgle$title = "  programming php  \ n"; $str 1 = LTrim ($title);//promgromming php \n$str2 = RTrim ($title);//  Programming Php$str3 = Trim ($title);//programming PHP

You can use the trim () function with parameters to remove the opening or closing whitespace without deleting the tab $record = "fred\tflintstone\t35\twilma\t  \ n"; $record = Trim ($record, "\r\n\ 0\x0b ");//The record value at this time is:" Fred\tflintstone\t35\twilma\t "

Change the case

Strtolower (), Strtoupper () operation of the entire string

Ucfirst () only the first character of a string, Ucwords () the first character of each word in the action string

EXAMPLE$STR1 = "FRED fintstone"; $str 2 = "Barney Rubble";p rint (Strtolower ($str 1));p rint (Strtoupper ($str 1));p rint ( Ucfirst ($str 2));p rint (Ucwords ($str 2));

Output Fred Fintstonefred Fintstonebarney Rubblebarney Rubble