PHP arrays and conditions, loop statement learning_PHP tutorial

1. Array

Example 1:

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The following is a two-dimensional array, which is often used in practice.

$mess = array('title'=>'Message title 1','content'=>'Content','ctime'=>'2012-1-1 12:34:23'); //Associative array

//Statement to traverse the array

//The first type
foreach($mess as $v){ //foreach can traverse associative arrays; while the for loop can only traverse enumeration arrays, not associative arrays.
//$v It is the value that receives the array element. The number of iterations of the loop body is determined by the array element
echo $v.'
';
}

//The second type
foreach($mess as $k=>$v){
//$k is used to receive the key name or index corresponding to the data element, $v is to receive the array element The value of
echo $k.'-----'.$v.'
';

Example 2:

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