dump($arr);
array(10) {
[0] => array(21) {
["id"] => string(2) "88"
........省略.........
["pu_pic"] => string(74) "1507/p_5594a950e92577.jpg|1507/p_5594a957e23c6.jpg|1507/p_5594a9518888.jpg"
........省略.........
}
[1] => array(21) {
[0] => array(21) {
["id"] => string(2) "88"
........省略.........
["pu_pic"] => string(74) "1507/p_5594a950e1789.jpg|1507/p_4444a951e23c6.jpg|1507/p_5594a9544fb44.jpg"
........省略.........
}
[2] => array(21) {
[0] => array(21) {
["id"] => string(2) "88"
........省略.........
["pu_pic"] => string(74) "1507/p_5594a950e1789.jpg|1507/p_4444a951e23c6.jpg|1507/p_5594a9544fb44.jpg"
........省略.........
}
源码
循环改变$arr["pu_pic"]中的值
for($i=0;$i
{
$thumb=explode('|',$arr[i]['pu_pic']);
$arr[i]['pu_pic']=$thumb[0];
}
dump($thumb);
}
dump($thumb)为空值;
dump($arr); 中的值也没有改变
回复讨论(解决方案)
认真检查一下你的 $arr 数组
在你贴出的片段中,除 $arr[0] 是一维数组外,其他的都是二维数组
你的代码是按 $arr[n] 是一维数组设计的,显然除了 $arr[0] 以外都不会进入修改代码的
认真检查一下你的 $arr 数组
在你贴出的片段中,除 $arr[0] 是一维数组外,其他的都是二维数组
你的代码是按 $arr[n] 是一维数组设计的,显然除了 $arr[0] 以外都不会进入修改代码的
我片段中的数组是贴错了。不好意思!
整个数组$arr是一个二维数组
array(10) {
[0] => array(21) {
["id"] => string(2) "74"
["pu_bt"] => string(14) "ssssssssssssss"
["pu_sfzj"] => string(1) "1"
["pu_lx"] => string(1) "1"
["pu_xjy"] => string(1) "0"
["pu_xjyb"] => string(0) ""
["pu_mj"] => string(2) "12"
["pu_zj"] => string(4) "3000"
["pu_qu"] => string(6) "天河"
["pu_qub"] => string(6) "车陂"
["pu_dz"] => string(0) ""
["pu_dh"] => string(7) "5555555"
["pu_lxr"] => string(0) ""
["pu_sm"] => string(0) ""
["pu_gk"] => string(0) ""
["pu_pic"] => string(74) "1507/p_55963e0e9685b.jpg|1507/p_55963e0eb388d.jpg|1507/p_55963e0ece755.jpg"
["puphoto1"] => string(0) ""
["puphoto2"] => string(0) ""
["puphoto3"] => string(0) ""
["thumburl"] => string(0) ""
["pu_time"] => string(10) "1435909646"
}
[1] => array(21) {
["id"] => string(2) "60"
["pu_bt"] => string(69) "非中介真实可靠!白云区广花路大型KTV酒吧转让出售"
["pu_sfzj"] => string(1) "1"
["pu_lx"] => string(1) "3"
["pu_xjy"] => string(3) "127"
["pu_xjyb"] => string(0) ""
["pu_mj"] => string(1) "4"
["pu_zj"] => string(5) "78000"
["pu_qu"] => string(1) "5"
["pu_qub"] => string(6) "广花"
["pu_dz"] => string(15) "广花大马路"
["pu_dh"] => string(11) "13660073733"
["pu_lxr"] => string(6) "阿娇"
["pu_sm"] => string(0) ""
["pu_gk"] => string(267) "白云区广花路现在有一处2600平方米营利中酒吧,证照齐全,内有大型KTV包房45间,加酒吧大厅,客源稳定,含路边带租约商铺7间,还有10年租期,现因老板全家移民,如有意者请电话联系,可前来考察。"
["pu_pic"] => string(74) "1507/p_55963e0e9685b.jpg|1507/p_55963e0eb388d.jpg|1507/p_55963e0ece755.jpg"
["puphoto1"] => string(0) ""
["puphoto2"] => string(0) ""
["puphoto3"] => string(0) ""
["thumburl"] => string(0) ""
["pu_time"] => string(10) "1434629313"
}
$arr = array( array( "pu_pic" => "1507/p_55963e0e9685b.jpg|1507/p_55963e0eb388d.jpg|1507/p_55963e0ece755.jpg"), array( "pu_pic" => "1507/p_55963e0e9685b.jpg|1507/p_55963e0eb388d.jpg|1507/p_55963e0ece755.jpg"),);for($i=0; $i<count($arr); $i++) { if(strlen($arr[$i]['pu_pic']) > 30) { $thumb = explode('|', $arr[$i]['pu_pic']); $arr[$i]['pu_pic'] = $thumb[0]; }}print_r($arr);
Array( [0] => Array ( [pu_pic] => 1507/p_55963e0e9685b.jpg ) [1] => Array ( [pu_pic] => 1507/p_55963e0e9685b.jpg ))
没有问题呀
$arr = array( array( "pu_pic" => "1507/p_55963e0e9685b.jpg|1507/p_55963e0eb388d.jpg|1507/p_55963e0ece755.jpg"), array( "pu_pic" => "1507/p_55963e0e9685b.jpg|1507/p_55963e0eb388d.jpg|1507/p_55963e0ece755.jpg"),);for($i=0; $i<count($arr); $i++) { if(strlen($arr[$i]['pu_pic']) > 30) { $thumb = explode('|', $arr[$i]['pu_pic']); $arr[$i]['pu_pic'] = $thumb[0]; }}print_r($arr);
Array( [0] => Array ( [pu_pic] => 1507/p_55963e0e9685b.jpg ) [1] => Array ( [pu_pic] => 1507/p_55963e0e9685b.jpg ))
没有问题呀
感谢!问题解决了。通过把您的代码和我写的代码,逐行对比,发现是我粗心大意造成的。把 【 $i 】写成了【 i 】

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

WebStorm Mac version
Useful JavaScript development tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 English version
Recommended: Win version, supports code prompts!
