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run code in 150+ php & hhvm versions
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<?php $js = "Morris.Donut({ element: 'piechart', data: [ {label: 'Option 1', value: $\{op1}\$ }, {label: 'Option 2', value: \${op2}\$ }, {label: 'Option 3', value: \${op3}\$ }, {label: 'Option 4', value: \${op4}\$ } ], colors: [\"#3228db\", \"#34225e\", \"#1abc3c\", \"#24495e\", \"#9b51b6\", \"#15a5a6\"], formatter: function (y) { return y + \"%\" } });"; //$op1 = 25; //$op2 = 40; //$op3 = 25; //$op4 = 10; $matches = array(); $vars = array(); $i=0; while(preg_match("/\$\{([^\}]*)\}\$/", $js, $matches)){ echo $i; print_r($matches); $vars[$i++] = $matches[1]; } print_r($vars);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( )