Php 查找While循环中第一个出现的字符串
我需要尝试在while循环中查找字符串的第一次出现。如果可以避免的话,我宁愿不使用Jquery来查找每个元素的第一个Php 查找While循环中第一个出现的字符串,php,while-loop,Php,While Loop,我需要尝试在while循环中查找字符串的第一次出现。如果可以避免的话,我宁愿不使用Jquery来查找每个元素的第一个 while ( $teacher_assignment_query->have_posts() ) { $teacher_assignment_query->the_post(); $assignment_fields = get_post_custom($post->ID); //print '$assignment_fields['t
while ( $teacher_assignment_query->have_posts() ) {
$teacher_assignment_query->the_post();
$assignment_fields = get_post_custom($post->ID);
//print '$assignment_fields['title'][0] and stuff here
});
这会打印出这样的作业列表
<li class="assignments fourthgrade"><a href="#">Do worksheet 2-1</a></li>
<li class="assignments fourthgrade"><a href="#">Do worksheet 1-2</a></li>
<li class="assignments fourthgrade"><a href="#">Do worksheet 1-1</a></li>
<li class="assignments fifthgrade"><a href="#">Volunteer somewhere</a></li>
<li class="assignments fifthgrade"><a href="#">Finish science project</a></li>
$last_title='';
while($teacher\u assignment\u query->have\u posts()){
$teacher_assignment_query->the_post();
$assignment\u fields=get\u post\u custom($post->ID);
如果($assignment_fields['grade']!=$last_title){
回显“”.$assignment_字段['grade']”。 ;
$last_title=$assignment_字段['grade'];
}
//在此处打印“$assignment_字段['title'][0]和其他内容
});
$last\u title='';
while($teacher\u assignment\u query->have\u posts()){
$teacher_assignment_query->the_post();
$assignment\u fields=get\u post\u custom($post->ID);
如果($assignment_fields['grade']!=$last_title){
回显“”.$assignment_字段['grade']”。 ;
$last_title=$assignment_字段['grade'];
}
//在此处打印“$assignment_字段['title'][0]和其他内容
});
您可以使用临时变量将当前结果与以前的结果进行比较,并在不同时更改标题。例如(元代码):
$previous_grade=”“;
while(条件){
//一些代码来获取你的数据
[...]
//将当前等级与上一等级进行比较
$current_grade=$assignment_字段['grade'];
如果($current_grade!=$previous_grade){
打印“$current\u grade ”;
}
//继续列清单
打印$assignment_字段['title'][0]和其他内容;
//更新临时变量
$previous_grade=$current_grade;
}
您可以使用临时变量将当前结果与以前的结果进行比较,并在不同时更改标题。例如(元代码):
$previous_grade=”“;
while(条件){
//一些代码来获取你的数据
[...]
//将当前等级与上一等级进行比较
$current_grade=$assignment_字段['grade'];
如果($current_grade!=$previous_grade){
打印“$current\u grade ”;
}
//继续列清单
打印$assignment_字段['title'][0]和其他内容;
//更新临时变量
$previous_grade=$current_grade;
}
<li class="heading">Fourth Grade</li> //new heading
<li class="assignments fourthgrade"><a href="#">Do worksheet 2-1</a></li>
<li class="assignments fourthgrade"><a href="#">Do worksheet 1-2</a></li>
<li class="assignments fourthgrade"><a href="#">Do worksheet 1-1</a></li>
<li class="heading">Fifth Grade</li> //new heading
<li class="assignments fifthgrade"><a href="#">Volunteer somewhere</a></li>
<li class="assignments fifthgrade"><a href="#">Finish science project</a></li>
$last_title = '';
while ( $teacher_assignment_query->have_posts() ) {
$teacher_assignment_query->the_post();
$assignment_fields = get_post_custom($post->ID);
if($assignment_fields['grade']!=$last_title){
echo '<li class="heading">'.$assignment_fields['grade'].'</li>';
$last_title = $assignment_fields['grade'];
}
//print '$assignment_fields['title'][0] and stuff here
});
$previous_grade="";
while(conditions) {
// some code to get your data
[...]
// Compare the current grade with the previous one
$current_grade=$assignment_fields['grade'];
if($current_grade!=$previous_grade) {
print "<li class=\"heading\">$current_grade</li>";
}
// Go ahead with the list
print $assignment_fields['title'][0] and other stuffs;
// Update the temporary variable
$previous_grade=$current_grade;
}