Function Abs()
Description:
mixed abs (mixed number);
Returns the absolute value of number. If the argument number is float, return type is also float, otherwise it is int (returns the absolute value of the entered number, floating point type returns floating point type, otherwise returns integer type)
Function Acos()
Description:
float acos (float arg);
Returns the arc cosine of arg in radians (returns the cosine of the angle)
Adabas D Function
Function ada_afetch()
Description:
fetch a result row into an array(return the result into an array)
Function ada_autocommit()
Description:
toggle autocommit behavior
Function ada_close()
Description:
close a connection to an Adabas D server (close a database connection)
Function ada_commit()
Description:
commit a transaction (submit a transaction)
Function ada_connect()
Description:
connect to an Adabas D datasource(connect a database)
Function ada_exec()
Description:
prepare and execute a SQL statement(execute a SQL statement)
Function ada_fetchrow()
Description:
fetch a row from a result(fetch a record from the database)
Function ada_fieldname()
Description:
get the columnname(get field name)
Function ada_fieldnum()
Description:
get column number (get the total number of fields)
Function ada_fieldtype()
Description:
get the datatype of a field(get the type of field)
Function ada_freeresult()
Description:
free resources associated with a result
Function ada_numfields()
Description:
get the number of columns in a result(get the number of fields in the result)
Function ada_numrows()
Description:
number of rows in a result(number of records in the result taken)
Function ada_result()
Description:
get data from results(get the result data)
Function ada_resultall()
Description:
print result as HTML table(output the result in HTML format)
Function ada_rollback()
Description:
rollback a transaction
Function apache_lookup_uri()
Description:
Perform a partial request for the specified URI and return all info about it, This performs a partial request for a URI. It goes just far enough to obtain all the important information about the given resource and returns this information in a class. The properties of the returned classes are:
status: the_request, status_line, method, content_type, handler
uri: filename, path_info, args, boundary, no_cache, no_local_copy, allowed, send_bodyct, bytes_sent, byterange, clength, unparsed_uri mtime, request_time
Function apache_note()
Description:
Get and set apache request notes,apache_note() is an Apache-specific function which gets and sets values in a request's notes table. If called with one argument, it returns the current value of note note_name . If called with two arguments, it sets the value of note note_name to note_value and returns the previous value of note note_name .
Function getallheaders()
Description:
Fetch all HTTP request headers(Get all HTTP header requests)
Example:
$headers = getallheaders();
while (list($header, $value) = each($headers)) {
echo "$header: $value
";
}
This example will display all recent header requests returned.
Note: This function only supports PHP under APACHE is an Apache-specific function which is equivalent to in mod_include. It performs an Apache sub-request. It is useful for including CGI scripts or .shtml files, or anything else that you would parse through Apache. Note that for a CGI script, the script must generate valid CGI headers. At the minimum that means it must generate a Content-type header.
Function virtual()
Description:
virtual()
ArrayFunction example
Function array()
Description:
Create an array
array array(...) returns an array of values, which can be appended with =>.
The following explains how to construct a two-dimensional array, how to specify the key of this array, and how to specify the value of the array in skip order in a normal array.
Example 1. array()
$fruits = array(
"fruits" => array("a"=>"orange","b"=>"banana","c"=>"apple"),
"numbers" => array(1, 2, 3, 4, 5, 6),
"holes" => array("first", 5 => "second", "third")
);
Function array_walk()
Description:
Use the function to process each element of the array
int array_walk (array arr, string func);
Use a function called FUNC to process each element of ARR. Those elements will be treated as parameters first passed to FUNC; if FUNC requires more than one parameter, FUNC will be called every time array_walk() All generate a warning message. These warning messages can be eliminated by adding the '@' symbol before array_walk().
Note: FUNC will directly process the elements in ARR, so changes to any element will directly change its value in the array.
Example 1. array_walk() example
$fruits = array("d"=>"lemon","a"=>"orange","b"=>"banana","c"=>"apple");
function test_alter( $item1 ) { $item1 = 'bogus'; }
function test_print($item2) { echo "$item2
"; }
array_walk( $fruits, 'test_print' );
array_walk( $fruits, 'test_alter' );
array_walk( $fruits, 'test_print' );
Function arsort()
Description:
Arrange an array in reverse order without changing its ordinal
void arsort (array array);
This function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is used mainly when sorting associative arrays where the actual element order is significant. Example 1. arsort()

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)”。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。


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