Is it possible to add characters to a string in php?

php can add characters to strings. Two implementation methods: 1. Use the string connector "." to splice the specified character to the beginning or end of the string. The syntax is "specified character. string" or "string. specified character"; 2. use substr_replace The () function inserts the specified character at the specified position of the string. The syntax is "substr_replace(string, specified character, specified position, 0)". The value at the specified position can be 0, negative or positive.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In PHP, you can add characters to a string ;This can be achieved through string splicing or substr_replace() insertion.

Method 1: Use the string connector "." to splice

The string connector "." can combine two or more More than three strings are concatenated into a new string.

The string concatenator "." can splice the specified characters to the beginning or end of the string.

<?php
header("Content-type:text/html;charset=utf-8");
$str1="1234";
echo "原字符串：".$str1."<br>";
$ch="A";
echo "指定字符：".$ch."<br><br>";

$str=$ch.$str1;
echo "在字符串开头添加指定字符：".$str."<br>";

$str=$str1.$ch;
echo "在字符串末尾添加指定字符：".$str;

?>

Method 2: Use the substr_replace() function to insert

The substr_replace() function replaces part of the string with another a string.

substr_replace(string,replacement,start,length)

Parameters	Description
string	Required . Specifies the string to check.
replacement	Required. Specifies the string to be inserted.
start	Required. Specifies where in the string to begin replacement. Positive number - starts at the specified position in the string Negative number - starts at the specified position from the end of the string 0 - at the first character in the string Start at
length	Optional. Specifies how many characters to replace. The default is the same as the string length. Positive number - the length of the string to be replaced Negative number - the number of characters to be replaced from the end of the string 0 - insert instead of replace

• Return value: Returns the replaced string.
  

Use the substr_replace() function to insert the specified character at any specified position; you only need to set the second parameter of the function to the specified character, and the third parameter to Specify the position and set the fourth parameter to 0.

<?php
header("Content-type:text/html;charset=utf-8");
$str1="1234";
echo "原字符串：".$str1."<br>";
$ch="@";
echo "指定字符：".$ch."<br><br>";

$str=substr_replace($str1,$ch,0,0);
echo "在字符串开头添加指定字符：".$str."<br>";

$str=substr_replace($str1,$ch,strlen($str1),0);
echo "在字符串末尾添加指定字符：".$str."<br>";

$str=substr_replace($str1,$ch,1,0);
echo "在第一个字符后添加指定字符：".$str."<br>";

$str=substr_replace($str1,$ch,-1,0);
echo "在倒数第一个字符前添加指定字符：".$str."<br>";
?>

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