Check whether the php array contains specified characters and array length

The in_array () function searches for the given value in the array.

Syntax
In_array (value, array, type)
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The code is as follows:

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$ OS _list = array ("mac", "nt", "irix", "linux"); // defines an array If (in_array ("irix", $ OS _list) // check whether the array contains lrix { Echo "the current operating system list contains lrix"; // If yes, the output content } Echo "<br> "; If (! In_array ("mac", $ OS _list )) { Echo "mac does not exist in the current operating system list"; // case sensitive, so this sentence will not be executed }

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In_array returns true if the given value exists in the array. If the third parameter is set to true, the function returns true only when the element exists in the array and the data type is the same as the given value.

If no parameter is found in the array, the function returns false.

Note: If the value parameter is a string and the type parameter is set to true, the search area is case sensitive.

Definition and usage

Syntax
Count (array, mode)

The count () function calculates the number of units in the array or the number of attributes in the object.

For an array, return the number of its elements. For other values, return 1. If the parameter is a variable but the variable is not defined, 0 is returned. If the mode is set to count_recursive (or 1), the number of elements in the array in the multi-dimensional array is calculated recursively.

 

// Array length
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The code is as follows:

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$ A [0] = 1; // create an array by assigning values respectively. $ a [] $ A [1] = 3; $ A [2] = 5; $ Result = count ($ a); // returns the number of elements in the array $ a 3 Echo $ result; Echo "<br> "; $ B [0] = 7; $ B [5] = 9; $ B [10] = 11; $ Result = count ($ B); // returns the number of elements in the array $ B 3 Echo $ result; Echo "<br> "; $ Result = count (null); // return 0 Echo $ result; Echo "<br> "; $ Result = count (false); // return 1 Echo $ result;

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Tips and comments
Note: If the variable is not set or contains an empty array, the function returns 0. You can use the isset () variable to test whether the variable is set.