PHP code to generate a password of specified length (picture and text)

I wrote a function to generate a password of a specified length. Friends in need can refer to it. The parameter $strength is used to determine what format of password is selected to be generated, including a string of lowercase letters, a string of uppercase letters, or pure numbers...

Written a function in PHP to generate a password of a specified length. The parameter $strength is used to determine what format of password is selected to be generated, including a string composed of lowercase letters, a string composed of uppercase letters, or pure numbers, or a combination of the above three and special characters. Call example: