PHP之string之implode()函數使用

時間 2019-12-05

標籤 php string implode 函數使用欄目 PHP 简体版

原文原文鏈接

implode

(PHP 4, PHP 5, PHP 7)

implode — Join array elements with a string

implode — 將一個一維數組的值轉化爲字符串

Description

string implode ( string $glue , array $pieces )
string implode ( array $pieces )
//Join array elements with a glue string.
//用 glue 將一維數組的值鏈接爲一個字符串。

Note:php

implode() can, for historical reasons, accept its parameters in either order. For consistency with explode(), however, it may be less confusing to use the documented order of arguments.

由於歷史緣由，implode() 能夠接收兩種參數順序，可是 explode() 不行。不過按文檔中的順序能夠避免混淆。

Parameters

glue

Defaults to an empty string.
默認爲空的字符串。

pieces

The array of strings to implode.
你想要轉換的數組。

Return Values

Returns a string containing a string representation of all the array elements in the same order, with the glue string between each element.
返回一個字符串，其內容爲由 glue 分割開的數組的值。

Examples

<?php
/**
 * Created by PhpStorm.
 * User: zhangrongxiang
 * Date: 2018/2/17
 * Time: 下午10:52
 */

$array           = array( '`lastname`', '`email`', '`phone`' );
$comma_separated = implode( ",", $array );
//`lastname`,`email`,`phone`
echo $comma_separated . PHP_EOL;

// Empty string when using an empty array:
echo '-------------------------' . PHP_EOL;
print_r( implode( 'hello', array() ) ); // string(0) ""
echo '-------------------------' . PHP_EOL;

$id_nums  = array( 1, 6, 12, 18, 24 );
$id_nums  = implode( ", ", $id_nums );
$sqlquery = "Select `name`,email,phone from `usertable` where user_id IN ($id_nums)";
//Select `name`,email,phone from `usertable` where user_id IN (1, 6, 12, 18, 24)
echo $sqlquery . PHP_EOL;
$sqlquery = "Select $comma_separated from `usertable` where user_id IN ($id_nums)";
//Select `lastname`,`email`,`phone` from `usertable` where user_id IN (1, 6, 12, 18, 24)
echo $sqlquery . PHP_EOL;

$ar = array( "hello", null, "world" );
echo implode( ',', $ar ) . PHP_EOL; // hello,,world

$picnames = array( "pic1.jpg", "pic2.jpg", "pic3.jpg", "pic4.jpg", "pic5.jpg", "pic6.jpg", "pic7.jpg" );
$allpics  = implode( "|", array_slice( $picnames, 0, 5 ) );
//pic1.jpg|pic2.jpg|pic3.jpg|pic4.jpg|pic5.jpg
echo $allpics . PHP_EOL;

$test = implode( [ "one", 2, 3, "four", 5.67 ] );
echo $test . PHP_EOL;//one23four5.67

/////////////////////////////////////////////////////////////////////////////////////
class Foo {
    protected $title;
    
    public function __construct( $title ) {
        $this->title = $title;
    }
    
    public function __toString() {
        return $this->title;
    }
}

$array = [
    new Foo( 'foo' ),
    new Foo( 'bar' ),
    new Foo( 'qux' )
];

//foo; bar; qux
echo implode( '; ', $array );