Based on php process control statements and loop control statements (explanation)

1. The process control statements mainly include if, ii...else, elseif (sometimes it can also be written as else if), and switch.

The statement format in PHP is:

if(conditions satisfy) {execution statement}

if (conditions satisfy) {execution statement} else {execution statement}

if (conditions satisfy) {execution statement} elseif {execution statement} elseif {execution statement} ..... else {execution statement}

switch(condition) {case 1: statement; break;

case 2: statement; break;

case 3: statement; break;

default: statement; break;}

If: There is only one condition

if...else: There are two conditions

elseif: There are multiple conditions

switch: multiple conditions When there are multiple conditions, elseif and switch statements have the same effect. But to avoid the complexity and lengthy statements, use switch statements

2. There are mainly three types of loop control statements: while, for, and do while. For example, output all integers less than 5.

The statement format in PHP is:

*******while statement**********

$i = 0;
while($i<5)
{
echo $i;
$i++;
}

*******for statement**********

for($i = 0;$i < 5;$i++)
{
echo $i;
}

****do while statement**********

$i = 0;
do
{
echo $i;
$i++;
}while($i<5);

【Notice】

1. The while loop implementation does not know the number of loops, and the for loop has known the number of loops.

2. In a complex PHP code, it may contain multiple conditional control statements, loop control statements and functions. It is very troublesome to find matching braces "{}". To this end, PHP provides another writing format, including if, while, for, foreach and switch, all available. The basic form of writing this form is: use the colon ":" to replace the braces "{" on the left, and use endif;, endwhile;, endfor;, endforeach;, endswitch; to replace the braces "}" on the right.

【Keywords】

break: terminate the loop

Continue: terminates the loop and continues the next loop until the loop ends

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