Summary of commonly used array and string functions in PHP

This article mainly shares with you a summary of commonly used array and string functions in PHP, hoping to help everyone.

Commonly used string functions:

//去除字符串首尾空格和特殊字符
trim（）
//截取字符串
substr() 、mb_substr()
//查找指定字符串在目标字符串中首次出现的位置
strpos()
//查找指定字符串在目标字符串中最后一次出现的位置
strrpos()
//替换字符串
str_replace()
substr_replace()
//计算字符串长度
strlen()
//转义 和 还原 字符串  (', '', \ , NULL )
addslashes()
stripslashes()
//重复字符串
str_repeat()
//打乱字符串
str_shuffle()
//分割字符串
explode()
数组常用函数
//创建数组
array()
//创建指定范围内数组
range()
//检查数组中是否存在某个值
in_array()
//检测变量是否是数组
is_array()
//计算数组中元素个数
count()
// 获取数组中部分或所有键名
array_keys()
// 获取数组中所有的值
array_values()
 
// 计算数组中所有值的和
array_sum()
//搜索给定值的键名
array_search()
//从数组中随机取出一个或多个单元
array_rand()
//数组排序
sort()      [不保持索引]
asort()     [保持索引]
//打乱数组
shuffle()
//拆分数组
array_chunk()
//合并数组
array_merge()
//将元素压入数组末尾(入栈)
array_push()

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