Examples from various sources (github,stackoverflow, and others). You can do so by changing the function definition, prepending the variable(s) to be received by reference with an ampersand: PHP PHP Passing Variables Only variables should be passed by reference In the first instance, a copy of the variable is made when the function receives it. 2010/09 (2) 2010/07 (2) カテゴリ 最近做项目，发现了一个报错 Only variables can be passed by reference， 意思是“只有变量能通过‘引用’”. PHP Fatal error: Only variables can be passed by reference in … When a function argument is passed by reference, changes to the argument also change the variable that was passed in. So passing a variable by value means, “Copying a Variable” to a new one, so any future change in the new variable will not affect the original variable. pass PHP Variables by reference Call by Reference I tested the new version with PHP 5.6.16 and it doesn't show up in that. The following example shows how arguments are passed by reference.
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