Home>Article>Backend Development> 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.
"; $ch="A"; echo "指定字符：".$ch."
"; $str=$ch.$str1; echo "在字符串开头添加指定字符：".$str."
"; $str=$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.
|
| length | Optional. Specifies how many characters to replace. The default is the same as the string length.
|
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.
"; $ch="@"; echo "指定字符：".$ch."
"; $str=substr_replace($str1,$ch,0,0); echo "在字符串开头添加指定字符：".$str."
"; $str=substr_replace($str1,$ch,strlen($str1),0); echo "在字符串末尾添加指定字符：".$str."
"; $str=substr_replace($str1,$ch,1,0); echo "在第一个字符后添加指定字符：".$str."
"; $str=substr_replace($str1,$ch,-1,0); echo "在倒数第一个字符前添加指定字符：".$str."
"; ?>
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