


Use the array function in PHP to create a new array. The phparray function array
The array in PHP is actually an ordered map. A map is a type that associates values to keys. This type is optimized in many ways, so it can be treated as a real array, or list (vector), hash table (which is an implementation of map), dictionary, set, stack, queue and many more possibilities. Since the value of an array element can also be another array, tree structures and multidimensional arrays are also allowed.
array
(PHP 4, PHP 5)
array — Create a new array
Description
Copy code The code is as follows:
array array ([ mixed $... ] )
Returns an array created based on the parameters. Parameters can be indexed using the => operator. For information on what an array is please read the Arrays section.
Note:
array() is a language construct used to represent arrays literally, not a regular function.
The syntax "index => values", separated by commas, defines the index and value. The index can be a string or a number. If the index is omitted, an integer index starting from 0 is automatically generated. If the index is an integer, the next resulting index will be the largest integer index so far, 1. Note that if two identical indexes are defined, the latter one will overwrite the previous one.
Although it is unusual, it is legal syntax to add a comma after the last defined array item.
The following example demonstrates how to create a two-dimensional array, how to assign key names to the corresponding array, and how to skip and continue numeric indexes in ordinary arrays.
Example #1 array() Example
<?php $fruits = array ( "fruits" => array("a" => "orange", "b" => "banana", "c" => "apple"), "numbers" => array(1, 2, 3, 4, 5, 6), "holes" => array("first", 5 => "second", "third") ); ?>
Example #2 Automatic indexing of array()
<?php $array = array(1, 1, 1, 1, 1, 8 => 1, 4 => 1, 19, 3 => 13); print_r($array); ?>
The above routine will output:
Array
(
[0] => 1
[1] => 1
[2] => 1
[3] => 13
[4] => 1
[8] => 1
[9] => 19
)
Note that index 3 is defined twice, retaining the last value of 13. Index 4 is defined after index 8, and the next automatically generated index (the one with value 19) is 9 because the largest index is 8.
This example creates an array starting from 1.
Example #3 array() indexed starting from 1
<?php $firstquarter = array(1 => 'January', 'February', 'March'); print_r($firstquarter); ?>
The above routine will output:
Array ( [1] => January [2] => February [3] => March )
In Perl, you can access the value of an array within double quotes. But in PHP, arrays need to be enclosed in curly braces.
Example #4 Accessing an array within double quotes
<?php $foo = array('bar' => 'baz'); echo "Hello {$foo['bar']}!"; // Hello baz! ?>
PHP Array function
PHP: Indicates the earliest PHP version that supports this function.
Function
Description
PHP
array()
Create an array.
3
array_change_key_case()
Returns an array whose keys are all uppercase or lowercase.
4
array_chunk()
Split an array into new array blocks.
4
array_combine()
Create a new array by merging two arrays.
5
array_count_values()
Used to count the number of occurrences of all values in the array.
4
array_diff()
Returns the difference array of two arrays.
4
array_diff_assoc()
Compare the key name and key value, and return the difference array of the two arrays.
4
array_diff_key()
Compare key names and return the difference array of the two arrays.
5
array_diff_uassoc()
Calculate the difference set of arrays by doing index checking through the callback function provided by the user.
5
array_diff_ukey()
Use the callback function to compare the key names and calculate the difference set of the array.
5
array_fill()
Fills the array with the given values.
4
array_filter()
Use callback function to filter the elements in the array.
4
array_flip()
Swap the keys and values in the array.
4
array_intersect()
Calculate the intersection of arrays.
4
array_intersect_assoc()
Compare the key name and key value and return the intersection array of the two arrays.
4
array_intersect_key()
Calculate the intersection of arrays using key name comparison.
5
array_intersect_uassoc()
Calculate the intersection of arrays with index checking, and use callback functions to compare the indices.
5
array_intersect_ukey()
Use callback function to compare key names to calculate the intersection of arrays.
5
array_key_exists()
Checks whether the given key or index exists in the array.
4
array_keys()
Returns all key names in the array.
4
array_map()
Apply the callback function to the cells of the given array.
4
array_merge()
Combine one or more arrays into one array.
4
array_merge_recursive()
Recursively merge one or more arrays.
4
array_multisort()
Sort multiple arrays or multidimensional arrays.
4
array_pad()
Pall the array to the specified length with values.
4
array_pop()
Pop the last element of the array (pop off the stack).
4
array_product()
Calculate the product of all values in an array.
5
array_push()
Push one or more cells (elements) to the end of the array (push).
4
array_rand()
Randomly select one or more elements from the array and return it.
4
array_reduce()
Use a callback function to iteratively reduce the array to a single value.
4
array_reverse()
Reverse the order of elements in the original array, create a new array and return it.
4
array_search()
Search for the given value in the array and return the corresponding key name if successful.
4
array_shift()
Deletes the first element in the array and returns the value of the deleted element.
4
array_slice()
Retrieve a value from the array based on the condition and return it.
4
array_splice()
Remove part of the array and replace it with other values.
4
array_sum()
Calculate the sum of all values in an array.
4
array_udiff()
Use callback function to compare data to calculate the difference of arrays.
5
array_udiff_assoc()
Calculate the difference set of arrays with index checking, and use callback functions to compare data.
5
array_udiff_uassoc()
Calculate the difference set of the array with index check, and use the callback function to compare the data and index.
5
array_uintersect()
Calculate the intersection of arrays and use callback functions to compare data.
5
array_uintersect_assoc()
Calculate the intersection of arrays with index checking and use callback functions to compare data.
5
array_uintersect_uassoc()
Calculate the intersection of arrays with index checking, and use callback functions to compare data and indexes.
5
array_unique()
Remove duplicate values from the array.
4
array_unshift()
Insert one or more elements at the beginning of the array.
4
array_values()
Returns all values in the array.
4
array_walk()
Apply a user function to each member of the array.
3
array_walk_recursive()

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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