How to implement PHP chain call?

How to implement chain calls in PHP: 1. Use magic function [_call] combined with [call_user_func] to implement; 2. Use magic function [_call] combined with [call_user_func_array] to implement; 3. Do not use magic functions 【_call】to achieve.

How to implement PHP chain call:

Method 1. Use magic function __call is combined with call_user_func to realize the

idea: first define a string class StringHelper, the constructor directly assigns value, and then calls the chain trim()# The ## and strlen() functions handle the calling relationship by using call_user_func in the called magic function __call(). The implementation is as follows:

<?php
class StringHelper 
{
  private $value;
  function __construct($value)
  {
    $this->value = $value;
  }
  function __call($function, $args){
    $this->value = call_user_func($function, $this->value, $args[0]);
    return $this;
  }
  function strlen() {
    return strlen($this->value);
  }
}
$str = new StringHelper(" sd f 0");
echo $str->trim(&#39;0&#39;)->strlen();

php test.php 
8

Method 2, use magic function __call combined with call_user_func_array to achieve

<?php
class StringHelper 
{
  private $value;
  function __construct($value)
  {
    $this->value = $value;
  }
  function __call($function, $args){
    array_unshift($args, $this->value);
    $this->value = call_user_func_array($function, $args);
    return $this;
  }
  function strlen() {
    return strlen($this->value);
  }
}
$str = new StringHelper(" sd f 0");
echo $str->trim(&#39;0&#39;)->strlen();

array_unshift(array,value1,value2,value3...)

array_unshift() The function is used to insert new elements into the array. The values ​​of the new array will be inserted at the beginning of the array.

call_user_func() and call_user_func_array are both methods of dynamically calling functions. The difference lies in the way parameters are passed.

Method three, do not use magic function __call to achieve

_call() to The trim() function is enough:

public function trim($t)
{
  $this->value = trim($this->value, $t);
  return $this;
}

$this pointer to facilitate calling the latter function.

Related learning recommendations:

PHP programming from entry to proficiency

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