PHP Basic Syntax Chapter 3 - Process Control_PHP Tutorial

one. Conditional statement

1.if statement syntax:

if (conditional statement 1) such as $a=$b or $a>$b

{

The command executed when conditional statement 1 is met, such as echo "a is greater than b";

}

elseif (conditional statement 2) For example $a<0 or $b<0

{

The command executed when conditional statement 2 is met, such as echo "because a or b is less than 0 and exceeds the optional range";

}

else does not need to be connected to a condition. The meaning of the branch is when neither conditional statement 1 nor conditional statement 2 is satisfied

{

Executed when neither conditional statement 1 nor conditional statement 2 is satisfied, such as echo "The content you entered is empty, please re-enter";

}

$b) { echo "a>b"; } elseif ($a<$b) {    echo "a Output result a>b

Example 2

=60 && $secore<70) { echo "Your score is passing"; } elseif($secore>=70 && $secore<80) { echo "Your grades are good"; } elseif($secore>=80 && $secore<90) { echo "Your grades are good"; } elseif( $secore>=90 && $secore<=100) {       echo "Your score is excellent";          elseif($secore>100 || $secore<0)                                           echo "                                                                                         echo                                                           echo                              echo " "Your grades are failing, please keep working hard"; } ?> Output results: Your grades are excellent

(2)switch statement syntax

switch (condition variable) for example: $a

{

The condition of the case condition variable. For example, $a>0: executed when the condition is met, such as echo a>0;break;

The condition of the case condition variable. For example, $a<0: executed when the condition is met, such as echo a<0;break;

default: output when none of the above conditions are met, such as echo "a and b are illegal";

}

=60 && $secore<70: $pj="You Your grades are passing";break; case $secore>=70 && $secore<80: $pj="Your grades are good";break; case $secore>=80 && $secore<90: $pj="Yours Excellent grades";break; case $secore>=90 && $secore<=100: $pj="Your grades are excellent";break; case $secore<0 || $secore>100: $pj="Yours The score is illegal";break; default: $pj="Your score is failing, keep working hard"; } echo $pj; ?> Output result: Your score is excellent

(3)Ternary operator syntax

echo (condition, for example: $a>$b)? If the condition is true statement "a>b": If the condition is not true "a

$b)?"a>b" :"a< b"; ?> 2. Flow control statement

Loop statement

1.for statement syntax

for ($variable name=0;$array name

{

echo $array name[$variable name];

}

Output results Zhang Chao, Qiao Bin, Chen Wei, Zhao Yongfeng

2.while statement syntax

$Variable name=0

while($variable name

{

echo $array name[$variable name];

$Variable name++

}

Output results Zhang Chao, Qiao Bin, Chen Wei, Zhao Yongfeng

3.foreach loop syntax

foreach($variable name as $variable rename)

{

echo $variable rename;

}

Output results Zhang Chao, Qiao Bin, Chen Wei, Zhao Yongfeng

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