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Introduction to the difference between php foreach and for statement usage_PHP tutorial
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- 2016-07-21 14:51:391267browse
//foreach
$tar = array (
1 => '东',
2 => '西',
3 => 'South',
4 => 'North',
5 => 'Southeast',
6 => 'Southwest',
7 => 'Northeast',
8 => 'Northwest',
9 => 'North and South',
10 => 'something',
);
The code is as follows. Copy the code
$TM = '西';
foreach( $tar as $v=>$vv )
{
if( $vv == $TM )
{
echo $vv.'-'.$v.'
;
break;
}
//echo $vv;
}
//West-2
//for
The code is as follows. Copy the code
echo '
;
for( $i=1;$i<=count( $tar ) ;$i++ )
{
if( $tar[$i] == $TM )
{
echo $tar[$i].'-'.$i.'
;
break;
}
}
//West-2
Summary: The results of foreach and for are exactly the same, but foreach is better than for in terms of efficiency. For on the home page, you need to know the array length and then use $i++ to operate. Foreach on the page does not need to know the array length and can automatically detect and enter the key. , and value.