PHP - Assignment Operators Example - Tutorialspoint

 

php assignment

PHP Assignment Help is all in 1 solution for PHP Homework Help and PHP Programming. Here you get top expert & Online PHP tutoring Help in 24x7 at cheap price. Arrays. An array in PHP is actually an ordered map. A map is a type that associates values to flytrkaps.ga type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more. The division operator ("/") returns a float value unless the two operands are integers (or strings that get converted to integers) and the numbers are evenly divisible, in which case an integer value will be returned. For integer division, see intdiv(). Operands of modulo are converted to integers.


PHP: Arithmetic Operators - Manual


An array in PHP is actually an ordered map. A map is a type that associates values to keys, php assignment. This type is optimized for several different uses; it can be treated as an array, list vectorphp assignment table an implementation of a mapdictionary, collection, stack, queue, php assignment, and probably more, php assignment.

As array values can be other array s, php assignment, trees and multidimensional array s are also possible. Explanation of those data structures is beyond the scope of this manual, but at least one php assignment is provided for each of them.

For more information, look towards the considerable literature that exists about this broad topic. An array can be created using the array language construct. The comma after the last array element is optional and can be omitted. This is usually done for single-line arrays, i.

For multi-line arrays on the other hand the trailing comma is commonly used, as it allows easier addition of new elements at the end. As of PHP 5. The key can either be an integer or a string.

The value can be of any type. On the other hand "08" will not be cast, as php assignment isn't a valid decimal integer. Float s are also cast to integer s, php assignment, which means that the fractional part will be truncated. Bool s are cast to integer s, too, i. Null will be cast to the empty string, php assignment, i. Array s and object s can not be used as keys.

Doing so will result in a warning: Illegal offset type. If multiple elements in the array declaration use the same key, only the last one will be used as all others are overwritten.

As all the keys in the above example are cast to 1the value will be overwritten on every new element and the last assigned value "d" is the only one left over. PHP arrays can contain integer and string keys at the same time as PHP does not distinguish between indexed and associative arrays. Example 3 Mixed integer and string keys. The key is optional.

If it is not specified, PHP will use the increment of the largest previously used integer key. It is possible to specify the key only for some elements and leave it out for others:. As you can see the last value "d" php assignment assigned the key 7, php assignment. This is because the largest integer key before that was 6. Note : Both square brackets and curly braces can be used interchangeably for accessing array elements e. Before it was only possible using a temporary variable.

An existing array can be modified by explicitly setting values in it. This is done php assignment assigning values to the arrayspecifying the key in brackets. The key can also be omitted, php assignment, php assignment in an empty pair of brackets php assignment. It is always better to initialize a variable by a direct assignment.

Note : As of PHP 7. Formerly, the string was silently converted to an array. To change a certain value, assign a new value to that element using its key. Note : As mentioned above, if no key is specified, the maximum of the existing integer indices is taken, and the new key will be that maximum value plus 1 but at least 0. If no integer indices exist yet, the key will be 0 zero.

Note that the maximum integer key used for this need not currently exist in the array. It need only have existed in the array at some time since the last time the array was re-indexed. The following example illustrates:. There are quite a few useful functions for working with arrays. See the array functions section. Note : The unset function allows removing keys from an array. Be aware that the array will not be reindexed. The foreach control structure exists specifically for array s.

It provides an easy way to traverse an array. Always use quotes around a string literal array index. But why? It is common to encounter this kind of syntax in old scripts:. This is wrong, but it works. The reason is that this code has an undefined constant bar rather than a string 'bar' - notice the quotes, php assignment.

It works because PHP automatically converts a bare string an unquoted string which does not correspond to any known symbol into a string which php assignment the bare string. For instance, if there is no defined constant named barthen PHP will substitute in the string 'bar' and use that. The fallback to treat an undefined constant as bare string is deprecated as of PHP 7.

Note : This does not mean to always quote the key. Do not quote keys which are constants or variablesas this will prevent PHP from interpreting them. As stated in the syntax section, what's inside the square brackets ' [ ' and ' ] ' must be an expression. This means that code like this works:. This is an example of using a function return value as the array index. PHP also knows about constants:. But the last example is in fact the same as writing:. At some point in the future, the PHP team might want to add another constant or keyword, php assignment a constant in other code may interfere.

For example, it is already wrong to use the words empty and default this way, since they are reserved keywords, php assignment. See the above examples for details on why as well as the section on variable parsing in strings. For any of the types integerfloatstringboolean and resourceconverting a value to an array results in an array with a single element with index php assignment and the value of the scalar which was converted.

If an object is converted to an arraythe result is an array whose elements are the object 's properties. These prepended values have null bytes on either side, php assignment. This php assignment result in some unexpected behaviour:.

Converting NULL to an array results in an empty array. Changing the values of the array directly is possible by passing them by reference. Array s are ordered. The order php assignment be changed using various sorting functions. See the array functions section for more information.

The count function can be used to count the number of items in an array. Because the value of an array can be anything, it can also be another array.

This enables the creation of recursive and multi-dimensional array s. Array assignment always involves value copying. Use the reference operator to copy an array by reference. Edit Report a Bug. Arrays An array in PHP is actually an ordered map. Syntax Specifying with array An array can be created using the array language construct, php assignment. Accessing array elements with square bracket syntax Array elements can be accessed using the array[key] syntax, php assignment.

Useful functions There are quite a php assignment useful functions for working with arrays. Warning The fallback to treat an undefined constant as bare string is deprecated as of PHP 7. So why is it bad then? Converting to array For any of the types integerfloatstringphp assignment, boolean and resourcephp assignment, converting a value to an array results in an array with a single element with index zero and the value of the php assignment which was converted.

Examples The array type in PHP is very versatile. Do you like red? Do you like blue? Do you like green? Do you like yellow? Since PHP 7. For newbies: An array index can be any string value, even a value that is also a value in the array. The value of array["foo"] is "bar". Note that array value buckets are reference-safe, even through serialization, php assignment.

Say you have a search function that returns an array of values on success or NULL if nothing found. Personally I use only square brackets, expect for accessing single char in string, php assignment.

 

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php assignment

 

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