ip正则婚配 - php
ip正则匹配 - php
preg_match_all ("#(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) (\d{1,4})#", $str, $phones);$arr = array_unique($phones);foreach($arr[0] as $v){ $v = str_replace(' ',':', $v); echo $v . "\n";?
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What is the difference between using foreach and iterator to delete elements when traversing Java ArrayList?
Apr 27, 2023 pm 03:40 PM
1. The difference between Iterator and foreach is the polymorphic difference (the bottom layer of foreach is Iterator) Iterator is an interface type, it does not care about the type of collection or array; both for and foreach need to know the type of collection first, even the type of elements in the collection; 1. Why is it said that the bottom layer of foreach is the code written by Iterator: Decompiled code: 2. The difference between remove in foreach and iterator. First, look at the Alibaba Java Development Manual, but no error will be reported in case 1, and an error will be reported in case 2 (java. util.ConcurrentModificationException) first
How to determine the number of foreach loop in php
Jul 10, 2023 pm 02:18 PM
The steps for PHP to determine the number of the foreach loop: 1. Create an array of "$fruits"; 2. Create a counter variable "$counter" with an initial value of 0; 3. Use "foreach" to loop through the array, and Increase the value of the counter variable in the loop body, and then output each element and their index; 4. Output the value of the counter variable outside the "foreach" loop to confirm which element the loop reaches.
PHP returns an array with key values flipped
Mar 21, 2024 pm 02:10 PM
This article will explain in detail how PHP returns an array after key value flipping. The editor thinks it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. PHP Key Value Flip Array Key value flip is an operation on an array that swaps the keys and values in the array to generate a new array with the original key as the value and the original value as the key. Implementation method In PHP, you can perform key-value flipping of an array through the following methods: array_flip() function: The array_flip() function is specially used for key-value flipping operations. It receives an array as argument and returns a new array with the keys and values swapped. $original_array=[
How to use the REPLACE function to replace a specified part of a string in MySQL
Jul 25, 2023 pm 01:18 PM
MySQL is a commonly used relational database management system that provides a variety of functions to process and operate data. Among them, the REPLACE function is used to replace the specified part of the string. In this article, we will introduce how to use the REPLACE function for string replacement in MySQL and demonstrate its usage through code examples. First, let’s take a look at the syntax of the REPLACE function: REPLACE(str,search_str,replace_str).
What are the string search and replace techniques in Python?
Oct 20, 2023 am 11:42 AM
What are the string search and replace techniques in Python? (Specific code example) In Python, strings are a common data type, and we often encounter string search and replace operations in daily programming. This article will introduce some common string search and replacement techniques, accompanied by specific code examples. To find a specific substring in a string, you can use the find() method or index() method of the string. The find() method returns the index of the first occurrence of the substring in the string.
PHP returns the current element in an array
Mar 21, 2024 pm 12:36 PM
This article will explain in detail about the current element in the array returned by PHP. The editor thinks it is very practical, so I share it with you as a reference. I hope you can gain something after reading this article. Get the current element in a PHP array PHP provides a variety of methods for accessing and manipulating arrays, including getting the current element in an array. The following introduces several commonly used techniques: 1. current() function The current() function returns the element currently pointed to by the internal pointer of the array. The pointer initially points to the first element of the array. Use the following syntax: $currentElement=current($array);2.key() function key() function returns the array internal pointer currently pointing to the element
What is the difference between foreach and for loop
Jan 05, 2023 pm 04:26 PM
Difference: 1. for loops through each data element through the index, while forEach loops through the data elements of the array through the JS underlying program; 2. for can terminate the execution of the loop through the break keyword, but forEach cannot; 3. for can control the execution of the loop by controlling the value of the loop variable, but forEach cannot; 4. for can call loop variables outside the loop, but forEach cannot call loop variables outside the loop; 5. The execution efficiency of for is higher than forEach.
Python built-in type str source code analysis
May 09, 2023 pm 02:16 PM
1The basic unit of Unicode computer storage is the byte, which is composed of 8 bits. Since English only consists of 26 letters plus a number of symbols, English characters can be stored directly in bytes. But other languages (such as Chinese, Japanese, Korean, etc.) have to use multiple bytes for encoding due to the large number of characters. With the spread of computer technology, non-Latin character encoding technology continues to develop, but there are still two major limitations: no multi-language support: the encoding scheme of one language cannot be used in another language and there is no unified standard: for example There are many encoding standards in Chinese such as GBK, GB2312, GB18030, etc. Since the encoding methods are not unified, developers need to convert back and forth between different encodings, and many errors will inevitably occur.
