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var_dump() and die()
This function displays structured information about one or more expressions that includes its type and value. Arrays and objects are explored recursively with values indented to show structure. As with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of this function, and save it in a string for example. Edit Report a Bug. Tip As with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of this function, and save it in a string for example. Parameters expression The variable you want to dump.
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Read this article for more details. The VarDumper component creates a global dump function that you can use instead of e. If you want to catch the dump output as a string, please read the advanced documentation which contains examples of it. In order to have the dump function always available when running any PHP code, you can install it globally on your computer:. This function dumps the variables using dump and immediately ends the execution of the script using exit. The dump function outputs its contents in the same browser window or console terminal as your own application. Sometimes mixing the real output with the debug output can be confusing. The third argument are the context providers, which allow to gather some info about the context in which the data was dumped. The built-in context providers are: cli , request and source. Since generating even debug output in the controller or in the model of your application may just break it by e.
One of the most popular way of debugging in PHP still remains the same — showing variables in the browser, with hope to find what the error is. What are other options? First, what is the problem with dd? Oh, ok, three rows. Now what are the values? At first I thought — maybe dd function has some parameters for it? Unfortunately not. Not easily readable, is it? Then you can combine several variables into one and maybe log it somewhere, for example.