How to call php built-in functions in smarty

CleverCode found that calling phpbuilt-in functions in smarty can be achieved through |. |No spaces before and after. If it is an array, you need to add @ to find the count.

When there is 1 parameter:
{{'param1'|functionName}}
For example,
{{$tmpStr|strlen}}

When there are 2 parameters:
{{'param1'|functionName:'param2'}}
{$tmpStr|substr:'1'}

When there are multiple parameters:
{{'param1'|functionName:'param2':'param3'..}}
{{$tmpStr|substr:'1':' 2'}}

{{'a'|str_replace:'A':$tmpStr}}

1 Marty determines whether it is empty

The following code php assigns to tmpStr if it is empty or not assigned; then 0 is output in smarty. This calls PHP's built-in function strlen
php code:
$smarty->assign('tmpStr','');

smarty code:
{{if $tmpStr|strlen > 0 }}
1
{{else}}
0
{{/if}}

##2 Marty finds the length of the array

Find the length of the array through PHP’s built-in functions is_array and count. The following code outputs 5
php code:

$smarty->assign('tmpArr',array(1,2,3,4,5));

smarty code:

{{if $tmpArr|is_array && $tmpArr|@count > 0}}

{{$tmpArr|@count}}
{{else}}
0

{{/if}}

##3 marty

StringReplace with the following code is to replace b in tmpStr with c

$smarty->assign('tmpStr','abb');

{{'b'|str_replace:'c':$tmpStr}}


Output: acc

4 marty interception field

$smarty->assign('tmpStr', 'abb');

{{$tmpStr|substr:'1'}}
Output:bb

{{$tmpStr|substr:'1':'1'} }
Output: b

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