Detailed explanation of the usage examples of PHP flow control statements

if (including if..elseif..else extended examples) Conditional statement, execute the corresponding statement according to the given conditions, is a basic statement

while Loop statement, loop specified according to the satisfied condition statement until the condition is not met

do..while loop statement is basically the same as the while loop statement. The difference is that the do..while statement first executes the specified statement once and then makes a judgment

for Loop statement, loops according to the given conditions until the conditions are not met, providing a more complex loop mechanism

"; } ?>

foreachLoop statement, good at processing arrays, extracting each unit keys and values until the end of the array

"ASP 部门","5人"=>"VB 部门","6人"=>"PHP 部门","8人"=>"Java 部门"); foreach($book as $value){ echo "$value
"; } foreach($book as $key=>$value){ echo "$key=>$value
"; } ?>

switch Conditional statements, switch statements are executed line by line. No code is executed at the beginning. Only when the value in a case statement and switchexpression When the value ofmatches, PHP will start executing the statement until the switch program section ends or the first break statement is encountered. If break is not written at the end of the case statement section, PHP will continue to execute the next case. Statement segment.

"; break; default : echo "用户名错误 
"; break; } switch($_POST['pwd']){ case $password : $p = true; break; case '' : echo "密码不能为空 
"; break; default : echo "密码错误 
"; break; } if(isset($u,$p)){ echo "登录成功"; } ?>

";break; case 1:echo "星期一
";break; case 2:echo "星期二
";break; case 3:echo "星期三
";break; case 4:echo "星期四
";break; case 5:echo "星期五
";break; case 6:echo "星期六
";break; } ?>

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