Mobile app interface programming technology-PHP strings for learning and implementation

: This article mainly introduces the mobile app interface programming technology-PHP strings for learning and implementation. if you are interested in PHP tutorials, please refer to them.

• Single quotes, double quotes

In PHP, you can use single quotation marks ''or double quotation marks. However, PHP allows us to directly include string variables in double quotation marks. The content in a single quotation mark string is generally considered a common character.

$ Str = 'hello'; echo "str is $ str"; // running result: str is helloecho 'Str is $ str '; // running result: str is $ str

• String connection

PHP uses the English dot. to connect two strings.

• Removes spaces at the beginning and end of a string.

  There are three functions in PHP that can remove the spaces of strings.
  Trim removes spaces at both ends of a string.
  Rtrim removes the right space of a string. r is the abbreviation of right.
  Ltrim removes the left space of a string, and l is the abbreviation of left.

  "; Echo" jar ". ltrim ($ str)." len "."
"; Echo" jar ". rtrim ($ str)." len "."
";?>

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The above introduces the mobile app interface programming technology-Learning to implement the PHP string, including the content, hope to be helpful to friends interested in the PHP Tutorial.