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How to detect duplicate values in PHP array?
I am working with a one dimensional array in PHP. I would like to detect the presence of duplicate values, then count the number of duplicate values and out put the results. For example, given the following array:
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PHP去除字符串中的最后一个字符 - 更多技术 - 清泛网 - 专注C/C++及内核技术
PHP去除字符串中的最后一个字符最常见的方法是substr($str, strlen($str) - 1)，但使用rtrim($str, , )更优雅。
<?php //PHP去除字符串中的最后一个字符
$str="aaaa,bbb,ccc,ddd,eee,";
echo rtrim($str,','); //第一种方法 trim($str,$chsrlist)去除两边的
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Using usort in php with a class private function
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Man this seems like such a weird way to do this. Oh PHP, how we love you.
– dudewad
Nov 28 '13 at 0:07
13
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How to get the first item from an associative PHP array?
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More information on the reset function: www.w3schools.com/php/func_array_reset.asp
– Paul Chris Jones
Dec 17 '19 at 12:38
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What does “async: false” do in jQuery.ajax()?
Specifically, how does it differ from the default ( async: true ) ?
7 Answers
7
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How to query MongoDB with “like”?
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Actually, it depends. If the query doesn't use an index, and must do a table scan, then it can certainly be expensive. If you're doing a 'starts with' regex query, then that can use an index. Best to run an explain() to see what'...
Difference between var_dump,var_export & print_r
...2] => 42
[3] => Array ([0] => 42)
)
var_export prints valid php code. Useful if you calculated some values and want the results as a constant in another script. Note that var_export can not handle reference cycles/recursive arrays, whereas var_dump and print_r check for these. var_exp...
Is == in PHP a case-sensitive string comparison?
I was unable to find this on php.net. Is the double equal sign ( == ) case sensitive when used to compare strings in PHP?
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How to Debug Variables in Smarty like in PHP var_dump()
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You can use {php} tags
Method 1 (won't work in Smarty 3.1 or later):
{php}
$var =
$this->get_template_vars('var');
var_dump($var);
{/php}
Method 2:
{$var|@print_r}
Method 3:
{$var|@var_dump}
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MySQL “WITH” clause
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Update: MySQL 8.0 is finally getting the feature of common table expressions, including recursive CTEs.
Here's a blog announcing it: http://mysqlserverteam.com/mysql-8-0-labs-recursive-common-table-expressions-in-mysql-ctes/
Below is my earlier answ...