Abandoned fish--how long does PHP take to get from getting started to giving up? 4

Today's Lesson: PHP 3-Day Foundation Consolidation video Tutorial "Yan 18"

1, arithmetic operators/subtraction, etc., divisor cannot be 0

2 comparison operators

$a = 5;

$b = 3;

$c = ($a > $b);

Var_dump ($c);

echo ' <br/> ';

$c = ($a = = $b);

Var_dump ($c);

echo ' <br/> ';

All equals

$a = 5;

$b = ' 5 ';

Var_dump ($a = = $b);

Var_dump ($a = = = $b);

echo ' <br/> ';

All equals the requirement type and value all want to wait

Interview questions

$a = 0;//1 2 3 false

if ($a = = = False) {

echo ' not found ';

}else{

Echo ' found it ';

}

33-tuple operator

Ternary operators

Given 2 numbers, find the bigger one.

$a = 5;

$b = 10;

$c = null;

if ($a >= $b) {

$c = $a;

}else{

$c = $b;

}

Var_dump ($c);

$c = ($a >= $b? $a: $c);

Var_dump ($c);

echo ' <br/> ';

4 logical operators

logical operators

You can marry a car if you have a room.

$h = true;

$c = true;

if ($h = = = True) {

if ($c = = = True) {

echo "married";

}else{

echo "regret";

}

}

if ($h = = False) && ($c = = true)) {

Echo ' Marry ';

}else{

echo ' regret ';

}

The fourth day, learning less today, mainly is sleepy, or did not give up

This article from "A Big big waste fish" blog, declined reprint!

Abandoned fish--how long does PHP take to get from getting started to giving up? 4