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Front-end learning of PHP statements

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[1] Conditional statement IF statement switch statement [2] loop statement while loop Do...while loop for loop foreach Loop

Conditional statements

For performing different actions based on different conditions

If statement

if code executed when (  condition) {true ;}

if (condition) {  trueElse  {  false  when executing code;}

if Code executed when (  condition) {true  ;} elseif (Condition  ) {trueelse  {   false code to execute at the time of execution;}

 
  php$t=date("H"); if ($t< "ten") {  echo "has a good morning!"  ElseIf ($t< ")  {echo " has a good day! "  Else  {  echo "has a good night!" ;}? >

Switch statement

Switch (expression) { case label1:  if expression = Label1;    Break ;    Case Label2:  if expression = label2;    Break ; default:  code  to being executedif  expression is different   from Both Label1 and Label2;}

 PhpSwitch($x){ Case1:Echo"Number 1";  Break; Case2:Echo"Number 2";  Break; Case3:Echo"Number 3";  Break;default:Echo"No number between 1 and 3";}?>

Looping statements

When writing code, you often need to run the same block of code repeatedly, and you can use loops to perform such tasks

While loop

 while {The condition is true) {  the code to execute;}

 Php$sum= 12;//the current level of hunger for small petsEcho"I'm hungry,:-(.";Echo"
"; while($sum<100){//the small pet's hunger level to 100, indicates that the small pet eats the full, does not have to continue to feed, does not have the satiety to continue to feed    $num=Rand(1,20);//random numbers, simulating small-pet-fed buns  $sum=$sum+$num;//Small pets eat small bread  Echo"I haven't eaten enough yet!" "; Echo"
";}Echo"I'm finally fed up, ^_^".;?>

Do...while Cycle

The loop executes the code block first, then checks the condition and repeats the loop if the specified condition is true

 Do {  while (condition is true);

 
  PHP  $sum  = 0;     Do {    $numrand(1,6);   Gets the random number from 1 to 6, simulates the dice    $sum$sum  $num;   forward step  }while ($num==6);   Echo "The Do...while example executes and goes forward:". $sum . "
";? >

For loop

For loop statements, initialization is evaluated unconditionally before the start of the loop, and the loop condition is evaluated before each cycle begins. If the value is true, the loop is resumed, the loop body statement is executed, and if the value is False, the loop is terminated. Increment statements are executed after each loop

 for (init counter; test counter; increment counter) {  code to be executed;}    

 
   for ($x$x$x+ +)  {echo "number is:$x
"?>

foreach Loop

The Foreach loop applies only to arrays, which iterate through each key/value pair in the array. For each iteration of the loop, the value of the current array element is assigned to the $value variable, and the array pointer moves one at a time until the last array element is reached. Generally there are two ways: Do not remove the label, remove the

[1] Only value, do not remove the mark

foreach ($arrayas$value) {code to be  executed;}    

 
  $colors Array ("Red", "green", "blue", "yellow"foreach ($colorsas$value) {   echo "$value
";}? >

[2] Simultaneously remove the mark and value

foreach ($arrayas$index$value) {  

 
  $colors Array (  "r" = "Red",  "g" = "green",  "b" = "Blue",  "y" = "yellow"   foreach ($colorsas$key$value) {  Echo  $key. ":". $value. "
";}? >

1 floor Munho learn php

is PHP the first programming language in contact with a landlord?

Re: Blue ideal for small matches

@ Munho Learn php, I learn the front-end, mainly js,php understand can

