In-depth parsing of the foreach function in PHP _php tutorial

Foreach function (PHP4/PHP5)
foreachThe syntax structure provides an easy way to iterate through an array.
foreachCan only be applied to arrays and objects, if an attempt is made to apply a variable to another data type, or an uninitialized variable will emit an error message.

There are two kinds of syntax:
Copy the Code code as follows:
foreach (array_expression as $value)
Statement
foreach (array_expression as $key = $value)
Statement

Example 1:
Copy the Code code as follows:
$arr =array (1,2,3,4);
foreach ($arr as $value) {
echo $value. "
";
}
?>

Example 2:
Copy the Code code as follows:
$arr =array (1,2,3,4);
foreach ($arr as $key = = $value) {
echo $key. " =====> ". $value."
";
}
?>

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