There are several ways to implement chain operations in PHP
The three methods of chain operations using PHP are to use magic function call combined with call_user_func to implement, to use magic function call combined with call_user_func_array to implement and without using magic function call.
There are many stringsfunctions in php. For example, to filter the spaces at the end of a string first, and then find its length. The general way of writing is:
strlen(trim($str))
If you want to implement a chain operation similar to that in js, for example, how should you write it like the following?
$str->trim()->strlen()
The following are implemented in three ways:
Method 1. Use the magic function call combined with call_user_func to achieve
Thought: First define a string class StringHelper, constructor directly assign value, and then call the trim() and strlen() functions in a chain, by calling the magic function call() Use call_user_func to handle the calling relationship. 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('0')->strlen();Terminal execution script:
php test.php
Method 2. Use The magic function call is combined with call_user_func_array to implement
<?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 $str->trim('0')->strlen();
Description:
array_unshift(array,value1,value2,value3...)
array_unshift() function is used to insert new elements into an array. The values of the new array will be inserted at the beginning of the array.
call_user_func() and call_user_func_array are both methods of dynamically calling functions. The difference lies in the way parameters are passed.
Method three, do not use the magic function call to achieve
Just modify _call() to trim() function:
public function trim($t)
{
$this->value = trim($this->value, $t);
return $this;
}The key point is to return $this Pointer to facilitate calling the latter function.
Method three, do not use the magic function call to achieve
Just modify _call() to trim() function:
public function trim($t)
{
$this->value = trim($this->value, $t);
return $this;
}The key point is to return $this Pointer to facilitate calling the latter function.
# I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!
Related reading:
How does PHP solve the problem of large website traffic and high concurrency
php custom function generates Cartesian product Method
PHP product flash sale timing implementation (solve large traffic solution)
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