Online PHP editor | output for aIWqA

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5: '1: pass != ""' '1: pass !== ""' '1: pass !empty' 'string 0: pass != ""' 'string 0: pass !== ""' 'string 0: fail !empty' 'null: fail != ""' 'null: fail !== ""' 'null: fail !empty' 'false: fail != ""' 'false: pass !== ""' 'false: fail !empty' 'integer 0: pass != ""' 'integer 0: pass !== ""' 'integer 0: fail !empty' 'foo: pass != ""' 'foo: pass !== ""' 'foo: pass !empty'
Output for 5.6.40, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: '1: pass != ""' '1: pass !== ""' '1: pass !empty' 'string 0: pass != ""' 'string 0: pass !== ""' 'string 0: fail !empty' 'null: fail != ""' 'null: fail !== ""' 'null: fail !empty' 'false: fail != ""' 'false: pass !== ""' 'false: fail !empty' 'integer 0: fail != ""' 'integer 0: pass !== ""' 'integer 0: fail !empty' 'foo: pass != ""' 'foo: pass !== ""' 'foo: pass !empty'