Requirements

Different versions of Laravel have different requirements:

• Version 8.0

  Bug fixes until 3/1/22
  Sec. fixes until 9/6/22

  • PHP >= 7.3
  • BCMath PHP Extension
  • Ctype PHP Extension
  • Fileinfo PHP Extension
  • JSON PHP Extension
  • Mbstring PHP Extension
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension

• Version 7.0

  Bug fixes until 10/6/20
  Sec. fixes until 3/3/21

  • PHP >= 7.2.5
  • BCMath PHP Extension
  • Ctype PHP Extension
  • Fileinfo PHP Extension
  • JSON PHP Extension
  • Mbstring PHP Extension
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension

• Version 6.0 (LTS)

  Bug fixes until 9/7/21
  Sec. fixes until 9/6/22

  • PHP >= 7.2.0
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension
  • Ctype PHP Extension
  • JSON PHP Extension
  • BCMath PHP Extension

• Version 5.8

  Bug fixes until 8/26/19
  Sec. fixes until 2/26/20

  • PHP >= 7.1.3
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension
  • Ctype PHP Extension
  • JSON PHP Extension
  • BCMath PHP Extension

• Version 5.7

  Bug fixes until 2/4/19
  Sec. fixes until 9/4/19

  • PHP >= 7.1.3
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension
  • Ctype PHP Extension
  • JSON PHP Extension
  • BCMath PHP Extension

• Version 5.6

  Bug fixes until 8/7/18
  Sec. fixes until 2/7/19

  • PHP >= 7.1.3
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension
  • Ctype PHP Extension
  • JSON PHP Extension

• Version 5.5 (LTS)

  Bug fixes until 8/30/19
  Sec. fixes until 8/30/20

  • PHP >= 7.0.0
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension

• Version 5.4

  • PHP >= 5.6.4
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension

• Version 5.3

  • PHP >= 5.6.4
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension
  • XML PHP Extension

• Version 5.2

  • PHP >= 5.5.9
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension

• Version 5.1

  • PHP >= 5.5.9
  • OpenSSL PHP Extension
  • PDO PHP Extension
  • Mbstring PHP Extension
  • Tokenizer PHP Extension

While there are earlier versions of Laravel, it's not recommended to use those earlier versions, as they make use of older technology.