How to remove character prefix in php

php method to delete character prefixes: first create a PHP sample file; then define a string; finally remove the specified prefix characters through the "substr($arr1,4);" method.

Recommended: "PHP Video Tutorial"

Original string 1,2,3,4 ,5,6,
Remove the last character ",", the final result is 1,2,3,4,5,6

The code is as follows:

1. $str = "1,2,3,4,5,6,";

2. $newstr = substr($str,0,strlen($str)-1);

3. echo $newstr;
4. //echo 1,2,3,4,5,6

The function that comes with the system You can achieve this effect in two ways:

1. substr($str, 0, -1)
2. //Function 2
3. rtrim($str , ",")

Remove a few characters at the front

$arr1=substr($arr1,4);//去除前4个字符

Remove duplicate element values ​​in the array array_unique()

<meta charset="utf-8" />
<?php 
$a1="206,206,206,201,206,201";
//$array = explode(&#39;,&#39;, $a1);  //字符串组成数组
$array1=implode(",",array_unique(explode(&#39;,&#39;, $a1)));
 print_r($array1);
?>

array How to increment the index value from 0 again

<?php
    $a=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");
    print_r(array_values($a));
    // 输出：
    // Array ( [0] => Cat [1] => Dog [2] => Horse )
?>

Intercept and remove the first character

<?php
$a = "About us";
$a = substr($a,1);
echo $a;
?>

phpGet The first character of the string

substr( $str, 0, 1 );

Usage:
substr(string,start,length)

<?php
echo substr("Hello world",0,10)."<br>";
echo substr("Hello world",1,8)."<br>";
echo substr("Hello world",0,5)."<br>";
echo substr("Hello world",6,6)."<br>";

echo substr("Hello world",0,-1)."<br>";
echo substr("Hello world",-10,-2)."<br>";
echo substr("Hello world",0,-6)."<br>";
echo substr("Hello world",-2-3)."<br>";
?>

Result:

Hello worl
ello wor
Hello
world
Hello worl
ello wor
Hello
world

Quote: http://www.w3school.com.cn/tiy/s.asp?f=demo_php_func_string_substr_2

JQ Delete the last one of string Or method of several characters

String: var s = "1,2,3,4,5,"
Goal: Delete the last ","
Method:
s =s.substring(0,s.length-1); Change

1 to 4, which is to delete the last four digits

Note: The first letter of length: "l" must be lowercase , "L" is wrong (Length)

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