<?php

/*

str_repeat--->重复字符串

string str_repeat(string $input,int $multiplier)

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multiplier:乘数

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echo strpeat(12,3);

str_shuffle:随机打乱一个字符串

string str_shuffle(string $str);

str_shuffle()函数打乱一个字符串,使用任何一种排序方案.

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hash:

hash->Generate a hash Value(message digest);

string hash(string $algo,string $data [,bool $raw_output])

algo:Name of selected hashing algorithm (i.e,"md5","sha256","haval160",etc....)

data:

Message to be hashed

raw_output:

When set to TRUE,outputs raw binary data.Default value(FALSE) outputs lowercase hexits.

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