PHP jpgraph a little hint (attached installation method)
PHP in the GD library itself is a very powerful drawing library, drawing the image can meet the daily requirements, but strong regulation is strong, or not convenient ha, because the powerful and convenient PHP-based GD Library Jpgraph is also born! PHP does not enable the GD library by default, because the Extension=php_gd2.dll comment needs to be opened in the PHP.ini configuration file. After opening, you can draw some of the wonderful patterns you want to draw. What the? Can't draw? Then go back to learning the basics! Today saw a video of a training organization, read the Jpgraph report this piece, according to the video method, in http://jpgraph.net/download/downloaded the version:3.0.7 version, After decompression, create a jpgraph directory under the examples directory and cut all files except examples in the SRC directory into the jpgraph directory you just created under the examples directory. Then copy the examples to the directory configured by Apache. But the results of a half-day trial, old error: Warning:strftime (): It is not safe to rely on the system's timezone settings. You is *required* to use the Date.timezone setting or the Date_default_timezone_set () function. In case you used any of those methods and you is still getting this warning, your most likely misspelled the timezone Iden Tifier. We selected the timezone ' UTC ' for now, but please set Date.timezone to select your timezone. In H:\TestFile\Examples\jpgraph\jpgraph.php on line 391 jpgraph error:http headers has already been sent. caused by output from file jpgraph.php at line 392.explanation:http headers has already beenSent back to the browser indicating the data as text before the library got a chance to send it's image HTTP header to thi S browser. This makes it impossible for the library to send back image data to the browser (since, would be interpretated as text By the browser and show up as junk text). Most likely are some text in your script before the call to Graph::stroke (). If This texts gets sent back to the browser the browser would assume that all data is plain text. Look for any text, even spaces and newlines, that might has been sent back to the browser. For example it's a common mistake to leave a blank line before the opening "
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