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)

• 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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