PHP operators

In order to operate on the variables, we can use arithmetical, comparison or boolean *operators*.

operator | PHP code | type of variable |

assignment | $a = "pluto"; | any variable |

addition | $a = $b + $c; | numerical |

subtraction | $a = $b - $c; | numerical |

multiplication | $a = $b*$c; | numerical |

division | $a = $b/$c; | numerical |

modulus (remainder of the division) | $a = $b%$c; | numerical |

increment by 1 | $a++; it's the same as $a = $a + 1; | numerical |

decrement by 1 | $a--; it's the same as $a = $a -1; | numerical |

equality | 5==5 | any variable |

inequality | 5!=4 | any variable |

greater than, greather than or equal to | $a>$b $a>=$b | any variable |

less than, less than or equal to | $a<$b $a<=$b | any variable |

and | ($a<1) and ($b>0) | boolean |

or | ($a<1) or ($b>0) | boolean |

not | !$a | boolean |

concatenation | $a="Break"."fast" | string |