PHP built-in functions are called in Smarty

Clevercode found that calling PHP built-in functions in Smarty can be implemented by | | There are no spaces before and after. If it is an array, count needs to be added @.

1 parameters at a time:
{' param1 ' |functionname}}
For example
{{$tmpStr |strlen}}

2 parameters at a time:
{' param1 ' |functionname: ' Param2 '}}
{$tmpStr |substr: ' 1 '}

multiple parameter times:
{' param1 ' |functionname: ' param2 ': ' Param3 ' ...}}
{{$tmpStr |substr: ' 1 ': ' 2 '}}

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

1 Marty to determine whether it is empty
The following code PHP is assigned to TMPSTR is empty or not assigned; then output in Smarty is 0. This is the built-in function called PHP strlen
PHP Code:
$smarty->assign (' tmpstr ', ');

Smarty Code:
{{if $tmpStr |strlen > 0}}
1
{{Else}}
0
{{/if}}

2 Marty to find the array length
The array length is evaluated using PHP's built-in functions Is_array and count, such as code output 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 String substitutionThe following code is to replace B in tmpstr with C
$smarty->assign (' tmpstr ', ' ABB ');
{' B ' |str_replace: ' C ': $tmpStr}}

Output: ACC

4 Marty Intercept field$smarty->assign (' tmpstr ', ' ABB ');

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

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

PHP built-in functions are called in Smarty