PHP array and condition, and loop statement learning

PHP array, condition, and loop statement learning. For more information, see 1. array

Instance 1:

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The following is a two-dimensional array, which is usually used.

$ Mess = array ('title' => 'message title 1', 'content' => 'content', 'ctime' => '2017-1-1 12:34:23 '); // associate an array

// Statement used to traverse the array

// First
Foreach ($ mess as $ v) {// foreach can traverse the associated array; while for loop can only traverse the enumerated array, not the associated array.
// $ V is the value of an array element. the number of cycles is determined by the array element.
Echo $ v .'
';
}

// Type 2
Foreach ($ mess as $ k =>v v ){
// $ K is used to receive the key name or index corresponding to the data element. $ v is the value of the received array element.
Echo $ k. '-----'. $ v .'
';

Instance 2:

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2). Code: