String related functions in php

This article mainly introduces string related functions in php. Interested friends can refer to it. I hope it will be helpful to everyone.

1. Function to find character position:
strpos(

The first occurrence in str The position of

stripos($str,search,[int]): Returns the position of the first occurrence of a string in another string. This function is useful for Case insensitive

strrpos(

The last occurrence of str in position, starting from int

strripos($str,search,[int]): Same as above, but is not case sensitive

2. Extract substring function ( Double bytes)
substr($str,int start[,int length]): Intercept the length string starting from the start position. If length is empty, intercept it to the end

strstr(

str2): intercept from

str2 from the beginning to the end, if not Then return false

stristr(

##str2): The function is the same as strstr, but it is not case sensitive

strrchr(

##str2): intercept backwards from the last searched character; Can be used to get the file name

3. Replace the string

str_replace(search,replace,

Search search in str

Use replace to replace

##str_ireplace(search,replace,$str): Same as above, this function is not case sensitive

strtr($str,search,replace): replace in this function cannot be "";

substr_replace(

rep ,

str original string,

start starting position, $length replacement The length of

int strcmp(

str2):

str2 respectively Is positive 1,0,-1 (string comparison)

strcasecmp() Same as above (not case sensitive)

strnatcmp("4", "14") Compare strings in natural order strnatcasecmp() Same as above, (case sensitive)

6. PHP string function split into arrays

str_split(

str is split according to the length of len and returns the array

split(search,

str is divided according to the search character and the returned array int is divided several times, and the subsequent ones will not be divided expload(search,$str[,int])

7. Remove spaces:

ltrim(), rtrim(), trim()Related recommendations:

PHP characters String definition methods and their differences

PHP string encryption enhanced version

How to convert PHP string into an array

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