PHP instance -- generate random strings

/**
+ ----------------------------------------------------------
* Generate a random string, which can be used to automatically generate a password with a default length of 6 characters and a mix of letters and numbers
+ ----------------------------------------------------------
* @ Param string $ LEN Length
* @ Param string $ type string type
* 0, 1, and other digits
* @ Param string $ addchars additional characters
+ ----------------------------------------------------------
* @ Return string
+ ----------------------------------------------------------
*/ 
 FunctionRand_string ($ Len= 6,$ Type= '',$ Addchars= ''){ 
 $ Str= ''; 
 Switch($ Type){ 
 Case0: 
 $ Chars= 'Abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxy '.$ Addchars; 
 Break; 
 Case1: 
 $ Chars=Str_repeat('123', 3 ); 
Break; 
 Case2: 
 $ Chars= 'Abcdefghijklmnopqrstuvwxy '.$ Addchars; 
 Break; 
 Case3: 
 $ Chars= 'Abcdefghijklmnopqrstuvwxy '.$ Addchars; 
Break; 
 Case4: 
             $ Chars = "When I come to him, I want to work in China. First, I want to work in order to become a people who can be outputted. When there is no such person, I will come to the secondary school. I use my peers to say that I have lived a great deal of life, and after many sub-accounts, I am working on social networks and small hosts, and I am working on the power line. This is a large amount of electricity. before the three-year war and ten-year war, the road map of anti-body and fighting will begin to discuss the new things from when two or more tianzi event teams approve and emphasize their thinking and in-room promotion phase by the pressure officer gas industry on behalf of the whole group number fruit phase guide each base or month Mao ran as if the shape of the mind-like do all to change the Customs question than show it most out-of-the-box did not see governance raise five the solution Forest's rice clusters mean only four horses recognize the article but the article is more grams and the Public hole leads into the seat transport and fly the crude oil to set up the question Quality refers to the establishment of a district to test the crowd therefore, Chang shiqiang is already rooted in a total of direct mission-style conversion and cut-9 You take the west holding total materials re-election Zhi Guan tune seven What mountain Cheng baibao more see must be really holding hot Commission hand change the management department has fixed the awareness of the disease as several first, the old light species, the sixth type with the instructions of the Fu 'an belt, each East, then the wind back to the south wide labor wheel north to build a car to the festival to do the work is the whole link class set number column temperature installation is no know Axis research solid color fast anti-shi Lashi set dalon weaving calendar flowers by seeking to pass the mouth broken condition mining fine gold industry product determination parameter layer end side clear to ten indeed research books the surgical factory must be away from the eyes of the sea, and the children's qingcai certificate is low, the eight trial rules are near the injection of the bumen iron should go to the county, the soldiers fixed in addition to the teeth like a thousand wins fine shadows ji bai ge effect set push blank configuration knife leaf rate description today selected yangde phone query difference half enemy starting film Shi Xiang Hua Jue slave name red continuous average drug mark difficult to store tester body tight liquid send quasi Jin Jiao Dimensionality Reduction ban Xu broke the technology to eliminate the bottom of the bed field trend sense to Shen benhe village structure photo volume not engaged in sub-grinding family fire section calculation according to the value of the United States Huang Yi Biao service early shift Mai cutting mail as the audience said, the attacker Zhang miwei, Hou Cao, He shufa, followed by the city's strict-diameter screw inspection on the Left page, anti-suxian, bitter English, fast-known as bad migration, and the province of BA Pai, He Weihe only needle how to plant Jing Zhu shengwang eye she grasp containing seedlings sub-Miscellaneous talk about food shot source examples caused by acid old but adequate short drag agent Xuan Ring falls first ruler wave Bearing Powder Jian Fu fish with the test engraved rely on enough full husband loss to wrap up promote branch bacteria rod weekly Yan teacher pick Qu chunyuan ultra negative sand seal for too much poor reduction Yang Jiang Mu Yan ball Chao Medical School ancient? 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 Break; 
 Default: 
 //Ooll and number 01 are removed by default. To add them, use the addchars parameter.
$ Chars= 'Abcdefghijkmnpqrstuvwxyzabcdefghijkmnpqrstuvwxyz23456789 '.$ Addchars; 
 Break; 
 } 
If($ Len> 10 ){//The number of digits is too long to repeat the string for a certain number of times.
$ Chars=$ Type= 1?Str_repeat($ Chars,$ Len):Str_repeat($ Chars, 5 ); 
 } 
 If($ Type! = 4 ){ 
$ Chars=Str_shuffle($ Chars); 
 $ Str=Substr($ Chars, 0,$ Len); 
 }Else{ 
 //Chinese random words
For($ I= 0;$ I<$ Len;$ I++ ){ 
 $ Str. = Msubstr ($ Chars,Floor(Mt_rand(0, mb_strlen ($ Chars, 'Utf-8')-1), 1 ); 
 } 
 } 
 Return $ Str; 
 }