JS for Loop and PHP loop

Source: Internet
Author: User

Syntax for the FOR loop:

for (initial condition; cyclic condition; state change)

  {alert (attr{i})  }

Instance for (var i=0; i<5; i++) Loop Body   1. Determine the condition first (do not meet the bounce loop)
2. (If conditions are met) perform loop body
3. Status change
Iterating through an array
1.for Loop traversal
For ($i =0, $i <count ($arr)); $i + +)
echo arr{$i}i. " <br> "
2.forerch Cycle
The first value of the foreach ($arr) as $v) is V, the loop body
{The second value gives V, the loop body
echo $v. " <br> ",,, ...
3.lise () and each () combined traversal

List ($k, $v) =each ($arr)
echo "{$k}-{$v}<br>"
4 pointer traversal

Echo current ($arr); takes the current pointer to the value of the element
echo Key ($arr); takes the current pointer to the index of the element
Next ($arr); Adjust the pointer down
Prev ($arr); Adjust the pointer up
Reset ($arr); Reset the pointer
End ($arr); hit the pointer to the last

Current ($arr);
while (Next ($arr))

While loop first condition, rear loop body

Do while first loop body, in condition

JS for Loop and PHP loop

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