如何在codeigniter中调用我的库函数？

I have created a library and a function defined for trim and show half character:

class Strlen_trim {
function trim_text($input, $length, $ellipses = true, $strip_html = true) {
    //strip tags, if desired
    if ($strip_html) {
        $input = strip_tags($input);
    }

    //no need to trim, already shorter than trim length
    if (strlen($input) <= $length) {
        return $input;
    }

    //find last space within length
    $last_space = strrpos(substr($input, 0, $length), ' ');
    $trimmed_text = substr($input, 0, $last_space);

    //add ellipses (...)
    if ($ellipses) {
        $trimmed_text .= '...';
    }

    return $trimmed_text;
  }
 } 

controller side

$this->load->library('Strlen_trim');
$this->Strlen_trim->trim_text();

view side

<?php echo trim_text($widgets['content'],15); ?>

On view side your calling function directly that is the error.

You can do it like this.

Way 1:

Controller Side:

 $this->load->library('Strlen_trim');
 $data = array(); 
 $data['widget_content'] = $this->Strlen_trim->trim_text($widgets['content'],15);
 $this->load->view('view_name',$data); 

View Side:

<?php echo $widget_content; ?>

Way 2:

Controller Side:

$this->load->library('Strlen_trim'); 

View Side:

<?php echo $this->Strlen_trim->trim_text($widgets['content'],15); ?>

I would suggest use CI inbuilt text helper instead of creating custom library for that ,

Load text helper in your autoload.php like this :

$autoload['helper'] = array('text');

In your view use character_limiter or word_limiter, whatever u want like this:

// with character_limiter()
<?php echo character_limiter($widgets['content'],15); ?>

// with word_limiter()
<?php echo word_limiter($widgets['content'],5); ?>

For more : https://www.codeigniter.com/user_guide/helpers/text_helper.html#word_limiter