In-depth analysis of the foreach function in php_PHP tutorial

Foreach function (PHP4/PHP5)
foreach The syntax structure provides a simple way to traverse an array.
foreach can only be applied to arrays and objects. If you try to apply to variables of other data types, or uninitialized variables, an error message will be issued.

has two syntaxes:

Copy the code The code is as follows:

foreach (array_expression as $value)
statement
foreach (array_expression as $key => $value)
statement

Example 1:

Copy code The code is as follows:

$arr=array(1,2,3, 4);
foreach($arr as $value){
echo $value."
";
}
?>

Example 2:

Copy code The code is as follows:

$arr =array(1,2,3,4);
foreach($arr as $key=>$value){
echo $key."=====>".$value."
";
}
?>

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