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This article mainly introduces how to use Throw, Try and Catch sentences in JavaScript. It is very detailed and has a certain reference value. Friends who are interested must finish it!

PHP for cycle

The number of times the PHP for loop executes the code block specified.

If you have determined in advance how many times the script will be run, you can use the for loop.

/ / Syntax: for (init counter; test counter; increment counter) {code to be executed;} / * Parameter: init counter: initialize the value of the loop counter test counter: evaluate each loop iteration. If the value is TRUE, continue the loop. Otherwise, the cycle ends. Increment counter: increase the value of the loop counter * / example:

Note: this example shows a number from 0 to 10.

PHP foreach cycle

The foreach loop applies only to arrays and is used to traverse each key / value pair in the array.

With each iteration, the value of the current array element is assigned to the $value variable, and the array pointer moves one by one until the last array element is reached.

/ / Syntax: foreach ($array as $value) {code to be executed;} / / instance:

Note: the loop demonstrated in this example will output the value of a given array ($colors).

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