PHP Common strings String Function instance Summary "conversion, substitution, calculation, interception, encryption" _php tips

The example in this article summarizes the common PHP string function. Share to everyone for your reference, specific as follows:

Nl2br

Function: Change line character to <br>

<?php
$str = "cat isn ' t \ Dog";
$result = NL2BR ($STR);
echo $result;
/** results
cat isn ' t
dog
* *

RTrim

Function: Clear the blank on the right

<?php
$str = "Hello World";
echo strlen ($STR). " <br> ";
$result = RTrim ($STR);
echo strlen ($result);
/** Results

Strip_tags

Features: Clears HTML and PHP tags from strings

<?php
$str = "<font color = ' Red ' >hello world</font>";
$result = Strip_tags ($STR);
echo $result;
/** results
Hello World
* *

Strtolower and Strtoupper

Features: Converting to case

<?php
$str = "Hello world!";
$result = Strtolower ($STR);
echo $result. " <br> ";
$result = Strtoupper ($STR);
echo $result;
/** results
Hello world!
HELLO world!
*/

Trim

Function: Remove the trailing space

<?php
$str = "Hello world!";
$result = Trim ($STR);
echo $str. " <br> ";
echo $result. " <br> ";
echo strlen ($STR). " <br> ";
echo strlen ($result);
/** results
Hello world!
Hello world!
*/

Str_ireplace

Features: Replacing

<?php
$str = "Zhang San";
$result = Str_ireplace ("Zhang", "Li", $str);
echo $str. " <br> ";
echo $result;
/** results
Zhang San
li San
* *

Str_repeat

Function: Repeat a string more than once

<?php
$str = "Hello jiqing!";
$result = Str_repeat ($str, 4);
echo $str. " <br> ";
echo $result;
/** results
Hello jiqing!
Hello jiqing! Hello jiqing! Hello jiqing! Hello jiqing!
*/

Str_replace

Features: case-sensitive substitution

<?php
$str = "Hello jiqing!";
$result 1 = str_ireplace ("Hello", "Hi", $str); Case-insensitive
$result 2 = str_replace ("Hello", "Hi", $str);//Case Sensitive
echo $str. " <br> ";
echo $result 1. " <br> ";
echo $result 2. " <br> ";
/** results
Hello jiqing!
Hi jiqing!
Hello jiqing!
*/

Str_word_count

Function: Returns the number of words in a string

<?php
$str = "Hello jiqing a!";
$result 1 = str_word_count ($STR); Number of returns
$result 2 = Str_word_count ($str, 1);//return array
echo $str. " <br> ";
echo $result 1. " <br> ";
Print_r ($result 2);
/** results
Hello jiqing a!
3
Array ([0] => Hello [1] => jiqing [2] => a)
* * *

Strlen

Function: Return string length

<?php
$str = "Hello jiqing a!";
$result = strlen ($STR);
echo $result;
/** result
* *

Substr_count

Function: Calculates the number of a string in another string

<?php
$str = "Hello jiqing, hello jim!";
$result = Substr_count ($str, "Hello");
echo $result;
/** result
2
* *

Substr_replace

Function: Replace from a location

<?php
$str = "Hello jiqing, hello jim!";
$result = Substr_replace ($str, "Zhangsan", 6);
echo $result. " <br> ";
$result = Substr_replace ($str, "Zhangsan", 6,6);//replace from one position, replacing several string
echo $result;
/** results
Hello zhangsan
hello zhangsan, hello jim!
*/

Substr

function: Get substring

<?php
$str = "abcdef";
$result = substr ($str, 0, 1); Starting from the No. 0, get 1
echo $result. " <br> ";
$result = substr ($str, 0,-1);//From the No. 0, gets the echo $result except the last string
. " <br> ";
$result = substr ($str, 2,-1);//From the 2nd, gets the echo $result except the last string
. " <br> ";
$result = substr ($str, -3,-1);//starting at 3, gets the string echo $result except the last one
. <br> ";
$result = substr ($str, -3,1);//starting at 3, gets the echo $result except the last string
. " <br> ";
/** result
a
abcde
cde
de
d
* *

Implode

Function: Converts an array to a string

<?php
$array = Array ("2013", "6", "3");
$date = Implode ("/", $array);
echo $date;
/** results
2013/6/3
* *

Md5

Functions: MD5 encryption of strings

<?php
$str = "Hello World";
$result = MD5 ($STR);
echo $result;
/** results
3e25960a79dbc69b674cd4ec67a72c62
* *

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